Don't go into texturing yet! that bake looks awful there are artifacts everywhere. To get a proper bake use these 2 methods 1: explode your mesh this is the method of separating meshes and baking the bakes later on in photoshop. as example bake your body separate from the belt and the shoulder stuff. This will help making…
Before you do that my suggestion is to fix your anatomy and maybe re-think some of design choices (for example he has manboobs and potbelly but his ribs are popping out , he has serratus anterior bun not external oblique or intercostalis muscle, for some reason his ribs are visible only in front )