What products do you already have? After you've done all the preperation work to get you to the waxing stage, then find yourself a nice wax, you will have to choose between Man made (sealent) or natural (Carnuba). Both have pro's and both have cons. Also factor into a good wax is how easy it is to apply and remove.
I personally like HD Wax from AutoGlym and I know quite a few other people around here rate it too, but there are many good waxes out there!