There are few times when you need to connect to iTunes:
* after the purchase (to "activate" it) -- which the store will do for you
* if you want to update the OS
* if you want to back it up
* if you want to copy music/photos/videos/app data from your computer to the iPad.
So, if you don't update the OS and you activated it at the store you'll just use it forever with the existing OS without ever touching a computer.
You get a power plug the charges it directly from the socket (faster than USB anyhow) so you are all set.