As cornsnake00 said, the Manual is an excellent place to start. Visit this site as often as possible and read as many posts as you can. We use alot of abbreviations and the terms you mentioned are all that...het - heterozygous, amel - amelanistic, hypo - hypomelanistic, anery(aneryth) - anerythristic, lav - lavender, cb - captive bred, wc - wild caught, carmot - caramel motley, F/T - frozen and thawed, etc.
As for classifying cornsnakes as "good" ones or "bad" ones, some of it is in the eye of the beholder. Some people prefer perfect patterns, others aren't as picky, and some even have a preference for the unusual (like myself). I have nothing against a perfect pattern and admire it greatly, but I also think aberrant patterns are very attractive in their own right.
Ideal color depends upon the morph/cultivar and again, depends upon the individual preferences. Everyone can usually agree upon the beauty of the extreme, ideal specimen, but when a snake is closer towards the "norm", it's hard to call. Okeetees are a perfect example...some people use the name only for those snakes that actually came from that area (or their direct descendents) while others use the term for a specific look, and what one person says looks like an Okeetee may not to another (the black borders aren't that wide, the ground color could be more orange/red, etc.)
As for actual bloodlines, cornsnakes aren't "registered" (yet) like dogs and cats are. Some people do use the "big" breeders names when identifying the background of their corns, which may have an effect on their desirablility. This is because many of the newer morphs originated in the hands of these "big" breeders and their reputations are also very rarely, if at all, questioned. For example, if you were to buy a lavender corn from Rich Zuchowski, you can guarantee that your new snake is exactly what it is supposed to be and of excellent quality. Rich was one of the founders of the lavender morph, his reputation is very well deserved, and his snakes are considered some of the best anywhere. And if a smaller, less known, but reputable breeder sold you a lavender corn and told you it was from SerpenCo stock, you'll know that somewhere in it's background, Rich had his hands in it. And the same goes for all the other great breeders out there (a good list of many of these wonderful corn breeders can be found in the Acknowledgements of Kathy's book, as well as Kathy herself). There are more, and you'll find they are regulars of this site and you'll soon recognize them.
I hope I've answered some of your questions. If you want any specifics, just ask on this site and you're sure to be answered. Or you could e-mail me direct and I'll do my best to help. I don't claim to know everything, but have a pretty good handle on alot of things, and have a good idea where to look if I don't have an answer.
