RTR (Ready-To-Run) kits generally contain everything you need to get started, except fuel and batteries for the controller and reciever (usually eight AA for the controler, and four for the reciever).
I would recopmmend a better, rechargable glow starter though. Most of the included glow starters are not the best quality. You can get a rechargeable one for about $15 - $20. They are well worth it.
Just add fuel, and have fun, but make sure to follow the manufacturers recommended method for breaking in the engine, or you engine will not last as long as it normally would.
As mentioned above, check parts availability at your LHS (local hobby shop). See what they have a lot of, and make a purchase accordingly.
Parts on the net are available every where, so it is not much of an issue.
Since you are just starting out, keep in mine that you will most likely break stuff, everybody does. If you can drive ten minutes to your LHS and get the part rigt away, it's a lot more fun to be up and running right away, than to have to wait a week for a six dollar part.
If you want to add upgraded hop-up parts latter on, the Hyper 7, Matrix, and Raze all have lots of neat goodies to play with.