As someone who has constructed my own site, I like the flexibility and control that gives me. I know of a few places that have a free site-builder feature that doesn't require any HTML on your part, but you'll have to compare what they offer for yourself, since I DO use HTML. These are them:

http://www.tripod.com (My first choice.)

http://www.webs.com (Used to be Freewebs. Lots of other people's first choice.)

http://www.bravenet.com (They also have a lot of cool free stuff you can use anywhere.)

~Neshomeh

Well, there's Livejournal, which I know a lot of people use for PPC-related stuff (including myself!). It's simple and easy, and there shouldn't be an age-restriction problem - and even on the free accounts there's a great number of good-looking layouts.

Ditto Webs.com - they have an easy page editor and pretty layouts that number in the hundreds.

Good luck, and I can't wait to see what missions you'll do!