I'll be letting you know how to do things. First, you need something that really interests you. This might be your favorite band, author, TV show, whatever. This makes topics on your page really easy. You need information for your page.
Information is things like dates, times, descriptions, and pictures.
A good way to get info like this is to do a search on your topic. All of the page makers ask for your name and address and some of your parents might not want you to enter this. Ask them what you should do. Another piece of advice is to never put a password in that has anything to do with your page. Someone could guess your password and ruin your page.