Welcome to the forums and congratulations with your new camera, have fun!
About lenses: which one is right for you depends on what kind of results you want. Do you want a tele or wide angle lens? A zoom or fixed focal length lens? Are you going to use it in low light, without a flash? If yes, then you'll want a lens with a large maximum aperture (low f-stop number), etc. So you'll probably have to learn and do some research before you can decide on what lens you want.
In the meantime, just use the lens that you got with the camera - it isn't a really terrible lens.