You might want to further explore the animation tools already out there. Here is a quick list:
iStopmotion (MAC, iPad, iPhone – $50)
easy to use interface. Can capture from DV cam, HDV cam, or import stills onto a timeline, and exports to Final Cut. Costs $50 for the Mac version – however, this is a great investment, and the new version includes all the Pro features (used to cost $500!!!). Slimmed down versions for iPhone or iPad
Monkey Jam (Windows – FREE)
easy to use, basic PC cousin to iStopmotion. Design for pencil tests, but can link to DV and webcams for photo stop-motion. Also allows you to import stills onto a timeline. And the best thing is, its FREE!
Pencil (Mac, Windows – FREE)
Open-source pencil test tool, ideal for tablet users who want to draw straight into a program. Work with layers and keyframes, rotoscoping etc. Limited drawing tools, but fun all the same.