Once you sign up and log in, go to "Fantastico autoinstaller" and autoinstall wordpress. Then when you go to your site, you'll have a fully working wordpress installation (wordpress is a blogging platform). You can add adsense stuff in, etc...
You can also get free wordpress hosting at wordpress.com. I'm not sure if they let you use adsense, though...
If you just want static web pages, you can try using Google Sites. This is a service by google that lets you use a weebly-like interface for making web pages. They don't look as pretty, but you can put adsense ads on your site in literally a few clicks.