gsm card reader using pic

Hi there, im new to doing much of anything with the pic, I have a project to design a gsm sim card reader using a pic as an interface. Im sure that there are people here who have done similar or the same so this looked like the best place to ask!
I have a general idea of what to do, its the subtleties (forgive spelling) that are beyond me at the moment, i have read a generalised version of the ISO 7816 protocol so i know some information regarding sim cards.
I think what im asking is if anyone has some general tips on how to get started on a pic program like this it would be much appreciated

Thanks a bunch

Ninebarmaximus