The lens listed by filippi is a great lens, especially for fast shot photos. I haven't had the chance to use a non zooming lens before, usually because I am trying to take photos of varying long distances of objects of varying sizes, and I am cheap.
Well, if you are chasing animals or want an animal that is 100 feet away to get a good shot, you should try for a 55ish-300 or slightly below telephoto lens. For non moving targets like buildings and plants, the one it comes with should be fine. The only IS general motor CHEAP lens I could find was a EF-S 55-250mm f/4-5.6 IS II, possibly discontinued for $250 new (can be found everywhere). If you shop around, you might be able to pick it up for cheap with buying the camera, for that matter some form of a bundle with something good for a few bucks more.
For the night photos of city and buildings, it would be best to get a tripod and/or to practice with ISO settings. The tripod is good for panoramic and long term stationary shots. Playing with ISO and long term shots can make great photos of night time and non moving targets or lighting if your lucky enough. You can use the lens it comes with for these shots.
IS= anti vibration, and STM is a motor for video (sound reduction when zooming) I gathered and for a nice premium. USM is also a motor for quicker movements. For hand held shots, IS can be a life savior.
You should shop around, the price of that camera isn't going to change most likely. Usually camera shops will sell cameras with a bonus for same price to a small premium. I bought my camera with an extra lens (55-300mm) for less than it's half price. Also try the camera out in store, with knowledge staff. (camera shop) Free lessons on camera use can be well worth it too.