Kids can do research, writing, planning and artwork using someone else's computer if they don't have one. Have at least one parent who can work with the team from beginning to end. Just because you have never done anything like this before doesn't mean you can't be successful. Put in the time and be determined to finish and you can. Choose a topic that will be useful to a specific group of kids.
Content is more important than fancy looks.
Don't choose a topic that can be easily found in other places, such as an encyclopedia. Collect as much information as you can on a topic before you write a plan for your Web site. Then start dividing it into smaller topics. A site should include general and useful information and personal experiences on that topic. Spend a lot of time planning the Web site.