Here are a few links where you could start on your project:

Tools for developing on the PocketPC: http://www.pocketpcdn.com/tools/index.html
3rd party development tools: http://www.cegadgets.com/cedevtools.htm
How to beam OBEX with the PocketPC: http://www.pocketpcdn.com/articles/obex.html
Database options for the PocketPC: http://www.cegadgets.com/cedatabases.htm
Windows CE Developers FAQ: http://www.cegadgets.com/wincedevfaq.htm

Good Luck!