Step 1: Swing by the Liquor Store.
![Laugh at above [laugh2] [laugh2]](/xen/styles/default/xenforo/smilies.vb/014.gif)
good idea, droog, before and after!
I don't think that there is a unified AK building resource, like MG42.us for MG42s. There are many tutorials with various degree of documentation scattered around the web, never mind youtube. Read as many as you can, some have gaps that will be filled by others.
There are forums like weaponeer and another one that I can't remember, that deal with just building shit that shoot and have many subtopics. People there are nice to ask if you want to make weird shit that haven't been done before.
AK is a nice platform because you can start with barreled kit and a receiver, then increase difficulty by fitting your own barrel (or turning your own), bending your own receiver or welding up demilled one. The more work you do, generally, the cheaper you can get parts. For some things, it's the only way.
When you collect/built every variation of AK (impossible), you can move on to PSL/FPKs, RPKs then to PKMs. Your skills and tools you gather along the way will serve you well in any other builds you may want to undertake.