You might consider selling directly from your Facebook page:
We even have a basic demonstration of that on our own Facebook page:
You can also use our built-in affiliate program to recruit marketers to drive buyers to your site or even sell your product directly from their site:
All that said, we're all software developers, server engineers, and support techs here, not marketing experts, so you'd do better to ask for help from more experienced hands in that particular field; search Google for "online marketing forum" to find where you can ask for advice and "talk shop". WarriorForum.com seems pretty popular, and I found http://www.reddit.com/r/marketing where people share and discuss plenty of good links, and you can do a "self" post there (writing an inquiry in text rather than sharing a link) to ask for help, tips, advice, etc.
You should probably consider setting up your own Web site rather than relying on an E-junkie Shop or eBay; that will give you much more flexibility to market your products however you wish and better credibility as an online retailer. Content-management systems like WordPress make it easier than ever to build and maintain your own site, and there's even an E-junkie plugin for WordPress that makes it easy to add cart buttons and product listings to your WP site. Many site hosts such as DreamHost even offer easy, one-click WordPress installation. You may find these Resources useful:
Finally, if you'd like to hire someone to set up a site for you, we can recommend the competent, E-junkie-experienced developers listed in our directory here: