OK, that helps. Is it a coil spring rear, or leaf spring? That will make a difference in how you do it.
Just to do a quick over view, on the front you will replace your coil springs with an airbag. This will require a bag mounting plate that will bolt over the hole in the spring perch. The top of the bag will mount to the plate, and the bottom will set where the coil spring did in your A-arm.
I'll have to finish this later. In the meantime take a look here-
Air Ride FAQ's