Most of the morphs are single genes (Blonde, axanthic/silver, amel, etc), but more recently, double and triple traits have become available (silver blonde, snow, snow blonde). If you REALLY want some good info, pick Dusty Rhoads' brain. He's the ultimate suboc source, and is the reason we have some of the morphs we do today. Another good person to talk to would be Lee Abbott (he bred my boy).
Just a heads up, though, their breeding season doesn't really sync up with other N. American colubrids. They're more of a late in the season kind of deal. If I remember correctly, they start breeding in the summer and the hatchlings are pipping late fall/early winter. I haven't (successfully) bred subocs yet. I did try with a pair a few years ago, but the male was too small, and it never took. I'm looking forward to trying again in about 2 years, depending on whether or not my female stops being so picky! Haha
When you get babies they'll prefer live, or lizard scented. It can be kind of difficult to get them on to f/t, and sometimes even rodents at all. My male takes f/t just fine, but I have to let him chase it around the tank. The female won't touch it if it's not live, despite my best efforts.