How to install mobile ROMs

Can anyone explain it to me, the complete steps, unrooting, installing modrecovery or whatever it takes to upgrade the android version of my HTC EVO 3D phone. Preferably links too. ty.
Answer #1
EVO 3D CDMA Android Development
http://forum.xda-developers.com/forumdisplay.php?f=1098
EVO 3D GSM Android Development
http://forum.xda-developers.com/forumdisplay.php?f=1230
Answer #2
what’s the difference between CDMA and GSM?
nevermind i got it. thanks ill try these forums..