New site structure recommendations please.

Hi there!!

I am going to launch a new site that sells US domestic and international toll free services. This is basically the expansion of my current site
http://www.bestcallservice.com/tollfree/ -- I want a top domain site for this Toll-free section. I will have about 20 pages in total initially. So, I am wondering whether I should make 2-level site structure (main and /), or I should just make every page on the top level without subs.

My toll free service will have 3 products (Follow-Me, Virtual PBX, and Unlimited Voicemail). I don't know if it makes sense to have each product to be in a separate directory because there are not many pages I can create. Please advise.

And please, if could, advise what kind of percentage I should make this brand new site content unqiue to avoid being considered as an identical site to its mother.

Thanks a lot!