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Want to turn your hobby into a business? Then you need to get serious. Make a full inventory of your current collection, and assign individual values (both original purchase value and estimated current market value) to every item you own. Put together a plan for obtaining more items, on a regular basis. Work out all your possible costs, including storage and packing. Research eBay to see if your sales projections are reasonable. Crunch the numbers to see how much profit you’re likely to generate.
Do all that, and the next step is easy. Create a few auction listings and get the business off the ground. The move from collector to eBay business is a short one!