>>7710713Bionicle (and Lego by extension) is like a language where all the words are interchangeable. Any part can be used for anything, but the key is finding the shape you want and figuring out how to implement it. The best place to start really is just taking a single piece you like and seeing what you can attach to it or vice versa. I think the big hump for most people is seeing each part as a mode of delivery for the shape, connection, or function it can provide, as opposed to it's intended function and nothing else (a foot, a head, armor, torso, etc). Try looking at other mocs and replicate them by identifying which parts they use and extrapolating any connections you can't see. Another way is to use an existing set or combiner as a base to build off of, but you usually end up with something lame if you follow the original design too closely.
Studio is fine, but it's more intuitive for bricks than bonks. If you're short on materiel, buy bulk parts. Go check listings on eBay for assorted Bionicle parts by the pound, find one that's fairly priced or has a good looking pile or container and buy as much as you think you'll need. Also make sure to soak used anything in warm soapy water for a few hours, children are flithy.
As far as guides go, I haven't seen any great step-by-step ones either, but it's a tough subject to cover in an approachable way. Maybe I'll do a longer organized paste if we ever get a new constraction theme. Until that happens, 30 Minute Mocs was a good series for introductory building techniques.
https://www.youtube.com/watch?v=VFFreFlfC9ASadly, Stippling disappeared a little while after G2 went tits-up, so there's only around a dozen episodes. It's not a guide per se, but you get a time lapse of the building process, an explanation of his reasoning behind part usage and construction, and even a little fanon if you're into giving your creations some backstory. Definitely good inspo if you're limited to more recent sets for parts.