There are different ways to add credits. Did you have anything particular in mind?
You may find some ideas here:
For this you would use either the title tool in PrPro or the better one in Ae (though that's learning a section another massive program) or perhaps create them in Photoshop and bring into PrPro as static shots. There are tutorials on this abounding around the web, including at AdobeTV and of course, my fav lynda.com. AdobeTV and many web tut's on this are free, "lynda" and other such places are subscription but go deeper and wider with one "provider" than most free services can.