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The statement of cash income to the IRS?

In 2007, I worked part time for a couple of months and is around $ 14,000 on W-2. They also sell books and textbooks used in the same year at the beachfront and has about $ 5,800, after deduction of expenses. My business was effective. I did not even use a bank account or applied to any business license, etc. In my original statement I do not understand what the income Businesses that do not know how to do it and do not want to miss the deadline of April 15 recently filed a 1040X and added $ 5800 as income from business and establish a schedule C. Does the IRS sanctions? Also, I realized I had to attach a timetable, and SE. Is it necessary to have a sales tax, business licenses, etc, etc for these cases? What Have I done good business by including cash income in the amended return? Does anyone know? Thanks

Prepare for the audit

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