You can test your setup by following the instructions on this help page:
http://www.e-junkie.com/ej/help.test.htm
We presume you already have products you want to sell and your own ideas how to market your products and manage your own business, so we simply provide some tools to help you do that on your own. We're always glad to reply to any specific questions you may have about how to use the tools we provide, such as how to accomplish a certain setup or how a given feature works, but we can't help much with general questions about how or what to sell online.
We don't perform any marketing for you, so it's up to you to drive traffic to your own Web site, maybe search Google for something like "online marketing techniques" or "online marketing forum" to find some tips and people willing to offer advice.
If you would like more one-on-one training, tutorials or just general consultation, consider hiring any of the fine folks listed in our Developer Directory for an hour or so of their time:
http://www.e-junkie.com/ej/developer-directory.htm