If I sell products via a site like Teachers Pay Teachers, how do I report the income?

[Carl]

As far as the IRS is concerned, since you sell product you are self-employed and "in business" for yourself for that specific income. So you will report all of your business income & expenses on SCH C as a part of your personal tax return. You'll get to that point in the program as you work it through. But Basically, all business income/expenses is entered under the Personal Income tab, Business Items section, heading under that section of "Business Income & Expenses (SCH C)"