That is not an easy question to answer in a forum setting, wondering5. If you are thinking of starting a business, you are best off having all of your specific plans personally reviewed by a professional. This is the best way to avoid any legal issues arising from your site.
A good site to review for information is
http://kcnn.org, with a click on "legal risks" to see areas of greatest concern for anyone operating or contributing to a website.
Very basically, facts and ideas cannot be copyrighted. Layouts and designs of a site cannot be copyrighted (although they could potentially have trademark protection). The idea to have a bidding website, therefore, is one that anyone can use.
With that said, websites and web pages
are copyrightable and so is any sort of media displayed on the website (text, photos, artwork, music, etc). This is where the risk of infringement can be greatest.
Again, I suggest you review your specific plans with a professional in your area. That is the best way to get advice tailored to you and your specific concerns. Good luck.
