Need all in one – with a content manager component that I can update?

I need to create an informational website with a shopping cart for selling professional services. I did research and found reliable webhosting; however, I then realized I have to learn a whole new software pkg (eg NetObjects) and HOW to create a website which I don’t want to do.Next I looked into website templates & a few I liked (eg a "swish" template); however, from what I learned I would still need to learn how to use site-building software in order to customize it. Given my needs (small biz, simple shopping cart, not too canned looking, not able to pay thousands to have one customized), what is the best & easiest way to create, maintain and adminster a small business website for a non-techie? I’ve been looking at sites like homestead.com that have decent templates but bad reviews. Any constructive advice/experience is greatly appreciated.

I really want to use Yahoo’s own Small Business Web Hosting and Domain, but I’ve heard a bunch of horror stories about it. I mean, I know that every web hosting company has a lot of BS said about them, because SOMEBODY has to have a bad experience with a company – its just the nature of things.
But, if you recommend Yahoo, great! That means I’m on the right track. If you don’t, then what do you recommend? I need unlimited hosting and bandwidth! Thanks!