If you have no idea, I would take it to a shop. But this is what you will need:
-Metra 99-3303 (if you want to keep the functions of your DIC)
-wiring harness (only if you dont get the 99-3303)
-antenna adapter (only if you dont get the 99-3303)
-steering wheel control module (if you have steering wheel controls and want to retain them)
You will be able to hook your subs up to the new radio. Likely you have a line out converter hooked up right now. The RCA's running from it will just go the radio instead of the LOC.