You didn't mention if you are buying just the plane. engine, and TX or are getting the combo with servos as well. Maybe you found a deal on eBay? There are so many versions of this plane. But not a bad choice for a trainer.
I have the ARF. Believe the difference in some cases is the RTF is truly ready to fly with almost no building. Their wings slip together with a metal rod. Ask the seller which version this plane is. The wings, fuse, and tail feathers should already be covered. If not, this is a non-standard version of the Superstar. If the wing needs to be permanently glued together, servos/tray have to be installed, etc.....then your LHS will have all the required items for finishing the plane...don't bother with Tower for that stuff.
Look to Tower or the LHS for additional field items...glow ignitor, fuel, starter, etc.