well, you can insert it everywhere if you can write HTML code. just copy paste the code into that website also, if you've got some inspiration, you can make a blog with blogger.com and place ads on it it's the best way for starters.
You can use adsense in an iframe. What ever you have within an iframe will show in the frame, so if your adsense is on the page you want to frame, the adsense will show up. Keep in mind though that google will show the ads relevant to the original site and may not suit the reewebs.com site. Get a free wordpress or blooger account. It would be a whole lot easier.