iROWiki explains a decent amount about Homunc. Most of homunc stuff is using the AI well, the basics of it involve a random number generator (which is the most frustrating part of raising a homunc - it can get to 99 and suck T.T). There's also the calculators that determine which homunc you are most likely to get when you use your embryo to call the homunc. Other than that, you just have to feed the thing, let it steal your job exp, and then let it beat on things xD