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Well, that is a pretty good project...what sort of guidance do you need? There are many things you'll need to determine, such as process flow, products, pricing, discounts, inventory, and many more. Have you designed the database for this site? You'll also have to have some way of accepting, validating, and processing payments. What forms of payments will you be accepting? Will you be charging vendors to sell on your site, or simply taking a percentage of sales?
I'd say that you may wish to break the site/functionality down into modules, and approach each one individually. The first ting to do will be to design the entire process (perhaps in the form of an analysis and design document, or flowchart) from beginning to end. Include all possibilities (user quits session midway through, payment is declined, etc...). This should provide you with the information you need to set up the databases behind the site.
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