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davidcyclebackIf you are selling a few cards here and there, that's a known as a good start. If you wanted to do this as a business down the road, you should slowly increase your sales and see how it works. If, after a while, it turns out you are selling a lot and making a good profit and people are clammering for you to sell their stuff, then is the time to consider starting your own catalog auction or whatever.
Being a knowledgeable, honest and reputable dealer starting now will only serve you well no matter what direction you go. If you are right now selling a few cards for a profit and your customers will testify that you are a honest seller and a good shipper, that's a good start. So, at this point I would be focused on being a good and effecient seller of the few cards you sell once in a while on eBay, rather than planning the catalog cover designs for your future million dollar auctions.