If you dont have this basic knowledge, I would suggest against starting up a nano. Like they all said, it is way more work to keep a nano tank. I just saw that you are only 13 years old, and I may be wrong, but I don't think most 13 year olds have the discipline to keep a high maintenance tank like this.
If you feel you can do it, check out
http://www.nano-reef.com for some great information and articles.