The best website to find information on customizing your Touch Pro is
http://forum.xda-developers.com .
XDA-Developers is more GSM centric, and as such, some of their software does not work on our phones. Especially the ROMs and Radios. Do not use any of the ROMs or Radios over there unless it specifically says CDMA. Play it safe and get CDMA ROMs from here, as GSM ROMs will brick your phone.
Open the Raphael forum and you should be able to find stuff about customization. Also, since the Touch Pro and Touch Diamond are basically the same phone, check our their Diamond forum as well for themes and such, but realize that some customization for the Diamond may not work on the Pro.