Need help

I suggest reading this thread: Build help. A person was asking questions about Venomancer builds, and I think the thread should be more than enough to help you decide what you want.

Likewise, you can read this thread: Veno Skill Build to figure out what skills you need to level. Disregard my comment about Nation Wars, however. It is no longer available for level 60+ players.

As for the rest, what exactly do you need help with? Are you confused about quests, your gear progress, your pets?

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sage or demon quest is a main quest line so it will be pretty self explanitory when you get there. Basically you have to pick a spiritual cultivation, Sage or Demon, and your choice will allow you to upgrade most skills when you aquire the appropriate skillbooks and your level is high enough. For veno's either path offers equally unique and powerful benefits so choose based on your playstyle and what you would like to do.

As for pets, you already got your tank which will help you for questing up to 100, but you will want to aquire a "Kowlin" for pulling bosses or mobs to fight them one at a time. He can also evolve into the awesome and speedy Drizzy!

TBH you don't really need an air or water pet as there are only a handful of quests sending you to battle in those realms. There are couple quests bosses in the water so maybe you want to pick up a water pet afterall for questing. And eventually in primal world there is a whole new water world so i guess a water pet is more relevent now that i think about xD
although any legendary(cash shop) pet that is evolved can fight in all terrain.
So for water pets any of the Turtle types will grow to be good enough tanks for quest purposes, and the Celestial Plumpfish can be tamed at i think 80 something and he is kinda tanky and can evolve also.
Air pets if you really want one are Windwalking piggy (rare spawn) and the Bee whose name i forgot but its level is in the 80's and its around plume area somewhere you find lots of them.

1 Str, 1 Vit, 6 Mag and 2 into Vit or Magic every two levels is correct.
Don't worry too much about gear until you reach level 90. Just use whatever you can get your hands on. Once you reach level 90, however, you will have to start thinking of the gear path you'll be taking.

I assume you will want G16 Nirvana, which is the best gear a casual player can afford. R9 (2nd cast) is the best gear one could have, but it's expensive to buy or it can be farmed but it takes a long time and a lot of effort. There are two routes for the Nirvana gear. One is bound which comes from the Twilight Temple route and is a little cheaper. The other is the Lunar path which makes the gear trade-able and can be sold in the future. TT path started with the level 90 gear and Lunar starts at level 95. Meanwhile you could use Morai level 95 gear or Morai level 100 gear (from Endless Universe, which is also BH100) until you get something better. If you need more help/information with the Nirvana gear let us know.

I will quote myself from the sticky pet guide:

Arcane Armor builds
If you start out with an AA build, your priority will be to have a decent tanking pet. Your physical defence will be low. Even if your magic defence is fine, the low HP will not help your case. You will surely want to have a pet that can work as your meat shield.

Even if you follow a Vit AA build and/or start out with Dreamchaser pack gear, which is really strong, you might still want to have a trusted tank pet by your side.

As you progress through the levels you will get stronger and you'll have to start picking a DD pet. If you've already picked one, you might want to level it up if it has fallen behind in levels. At later levels, your playstyle and how often you squad or solo will determine what pets you use but I would still advice keeping a tank pet around - just in case!

At endgame you'll probably rely on your squad more than your pet so you'll most likely use your DD/support pet(s) more than a tank pet, unless your tank pet is also your DD pet.

You can also read 2. Types of pets there to figure out which DD and luring pets you might want (it would be too long to quote everything here). You will also want an air pet. Water pet doesn't matter too much. If needed, just tame any at-level water pets you find and then get rid of it once you're done with your water quests.

Question, what is your current cultivation? If you get stuck you can use this site for reference. The early quests might be a bit outdated as of now, but most of it should be the same. Frostcovered Grounds is for level 51, by the way. I'm not sure what level you are right now. Maybe you just haven't reached that part yet. Note that the instance is not part of your cultivation quest-line.

Lastly, Sage and Demon are both great for Venomancers. It's really up to you, how you like to play and what skills you like to use. A very, very short summary of the two would be... Sage is a bit more defensive, support oriented and Demon is more offensive. Both can work well in all situations though. I suggest looking here to compare the skills (the drop down menu let's you pick Sage or Demon).

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No problem!
The Walker is still a little better than the Flaming Crystal (Crystaline Magmite pre-evolution) because of the slightly higher HP/defence and evolution skill. That's just nitpicking, though. If you already have a Walker there's no reason to get a Flaming Crystal pet.

There's not much else to say otherwise. Just keep playing the game, and if you have any more questions you can comment in the thread again.
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you should use dark wanderer to DD when you dont need your tanking pet.

But honestly, I used glacial walker for pretty much everything besides I had dark wanderer and many other pets. He was my most tanky pet, and have decent DD. Even though he is slow, I used him for pulling too, I just used 'Tough' (reduce damage taken for a short duration) and sent him to pull, and it was quite rare he failed on me. It was just easier to focus on one pet only and not needing to swap around (I was rather poor as I couldnt afford to level up pet skills, and I found it boring to level up so many pets too, but of course, you may be different!)
If I were to start over with venomancer today I would go with a walker with bash, howl, roar, tough. Bash being main attack, howl for more damage for me, roar for emergency, tough for pulling and hard-hitting stuff. I might have wanted to swap howl out with pierce if I went demon after reaching Lv89+.
At level 101 I caught a dino when it came out. That DD pet was first time I found a pet useful enough to use other than the walker. Though I ditched him when the pet evolutions came out as I then could use my phoenix in instances.
For DD pet I kinda only used bash/flesh realm + howl + shriek. Last skill slot I wanted to get the buff that increase pet's physical attack (though I couldnt afford it back then, and the day today I use legendary pets). Now you can win the buff in venomancer instance if your points allow you to, but I guess that's also first at Lv100+​​

Yeah, some people put skills in the AH and usually sell them cheaper than the NPC. Keep an eye for that.​​

Open AH - Filter Items - Other - Books - Pet Skill Books​​