To qualify as a hobby, you would have to do this with no intention of making a profit. In this case you would not have to pay self employment income but you could not claim any expenses.
If you intend to make a profit then you would report this as self-employment income. you can claim any expenses that were related to this income. These expenses lower your business income and therefore lower your tax.
For more information refer to the following TurboTax articles and IRS tips.
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