ebay business credit

I have a business selling online cash used textbooks, etc., how can I earinings money to the IRS?
Is mostly sold on Ebay and other auction sites, and I about $ 20,000.00 per year after all matters related invoices are paid. Not much, but a good part-time work. How can I turn this into a real business, which is in the books, and my income can be varified for loans, credit lines and mortgages.
Just make a list C to 1099 – that's how http://www.irs.gov/pub/irs-pdf/f1040sc.pdf individual companies in this way, you able to declare their income and deduct expenses incurred in managing the company – for example, eBay listing fees, PayPal fees, shipping, etc.
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