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As for some general getting started guides, I'd take a look in your local newsagents for some internet magazines like .Net or Practical Web Design magazine (if you are UK based anyway) - they often have articles on this kind of thing and can give you some suggestions. Plus there is always good ol' Google.
I have my own store website. It costs me a little under $100 a year to maintain. That includes hosting, the domain and SSL certificate. I use zen cart and love it. If you have little computer experience you can find many online hosted shopping carts that come in a range of prices.