I hope this doesn't sound harsh, but I think you need to make a couple of batches before you even plan to sell. You need to make sure that what you are making is safe to use, lye heavy soap can really hurt.
As far as recipes, I would check out Millersoap.com
She has a lot of recipes for you to try and her web site it pretty much a book on soap making.
I would also reccomend the book, The Soap Maker's Companion. She covers everything you need to know about soap making. Once you have a recipe from one of those two sources, I would start to play around with Soapcalc.com They have a chart and graph that tells you what your soap properties will be like(hardness, moisterizing, lather, ect)
I would also start looking on some soap forums or reading through the soap makers thread. The more knowledge you have, the better soapmaker you will be.