1) Find out if your car has keyless entry - find the RPO code sticker. If the car has the memory preset option I'll bet you a
it has keyless entry
2) Find one or two remotes - if Adamh's source doesn't work also try a stereo shop - but his idea is better
3) Search threads here to figure out if you can program it yourself or if a Tech II tool is necessary you have a trip to the dealer coming.