Glad you found us!
I know there are several books on the market that deal with handbag design. Typing the keywords "leather handbags" into Amazon will show you a few. They're good reading, and some books even have fold-out patterns. Your decision to start with a kit is a good way to go.
Also, just wanted to make you aware of K.C. Leatherwerks just a few miles from the Knoxville Tandy. If Knoxville is in your proximity, K.C. offers a number of leatherworking classes that may interest you. Plus they stock some items (like Hidecrafter stamps) that Tandy doesn't.
Make yourself at home, and fire away with any questions!
Regards, -Alex