OK. Your two lenses will do just fine for that, I think, and you don’t need anything else. If you want to get another, I’d recommend Canon’s 50mm f/1.8 lens; it gets great reviews, it’s very inexpensive, and it’s very “fast”- it will take shots in dark environments without requiring long blurry exposures.
21 posts and no one has said memory cards?
If there is a Micocenter near you, go get a handfull of 2 to 4Gb cards for next to nothing. You can get larger cards, but finding the photo you are looking for gets quite ‘needle in haystacky’.
Spair battery?
Have fun with your new toy!
If you do get a tripod, I recommend a remote shutter release. They’re really cheap ($10?) and definitely come in handy for longer exposures.