The most important thing of all to a breeder, is having a market. Before starting anything else, make sure that you can sell any hatchlings that you breed or you can end up with a lot of small mouths to feed - which can get very expensive. The Corn market has been very slow over the last couple of years. I sold my last four 2009 hatchlings earlier this year - that's 18 months of feeding and heating.
Firstly, check out whether Corns sell well in your area. Look in pet stores and in local advertising in newspapers and online. Then figure out what sort of morphs sell well - the cheap ones, midrange or expensive. Then work out whether you can afford to sell at competitive prices for those morphs, or whether you need to try and produce a different morph so that you're not in direct competition with existing breeders in your area.
You can sell online to anywhere in the States, but you can only ship via FedEx which is a pain to get registered with (from what I've read here). Also, it adds $50-70 to the cost of a Corn, so there's not much point bothering if you're breeding Normals or low-end morphs which won't tempt buyers into spending that extra money on shipping.
All of these factors might influence what type of Corns you choose to breed. And that's before you start looking at the technicalities of breeding.
Good luck!