Here are some very basic builds. As you level up, you just use the gear you find along the way. When you reach level 70, go read the letter on the table behind Sergeant Knox in Protector's Enclave in order to do the quest An Important Invitation to get a complete set of 644 item level starter gear.
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https://cloakalliance.wordpress.com/2019/03/02/basic-hr-build-for-m16-preview