Hi curtdee,
I would suggest looking at the second hand market, even starting with things around the house that you have no further use for. Doing that will get your feet wet, might even give you an idea of a niche, depending what it is you have to sell, and the popularity of the bidding.
Garage sales, weekend markets, charity shops, all great sources for very cheap second hand products, and ebay byers respond well to second hand products.