A search for bounce to disk or bounce options in your PT Reference Guide.pdf should bring up info on bouncing to Stereo Interleaved for CD burning. AIFF is probably the best way to go if you are going to burn with iTunes.
This Answerbase item tells you how to do the Pro Tools end:
http://answerbase.digidesign.com/detail.cfm?DID=8349
"How do I burn an audio CD of my audio in Pro Tools?"
For the iTunes end of things:
Click on the desktop so you are in the Finder.
In the menu, choose Help
In Help, choose iTunes
look for something like "How do I make my own audio CDs?"
or do a search in iTunes help for audio CD.