Go to the GSm tom updates section(do not install a cdma rom). read everything there on how to flah a rom. then downdload the hspl unlocker to unlock your phone, this step must be done first before you are able to flash a custom rom. All the info and help you need will be there. again, the gsm rom updates section for touch pro 2.
Here is a link that should help you:
http://forum.ppcgeeks.com/showthread.php?t=99948