I have to itemize, but my employer did not give me a 1099 as income too low. How do I include this income and related expense?

If you weren’t paid $600 or more, a business isn’t required to send you a 1099-MISC, but as you note above, you still need to report the income.

You will enter the income and expenses on Schedule C of your tax return. Below is information on how to be brought to that section of TurboTax.  If you did not receive a 1099, then select to enter the income as General Income (see sample screenshot attached.)

To enter your self-employment income not reported on a 1099-MISC:

1. Open TurboTax and select to continue with your tax return.
2. Type Schedule C in the Search box
3. Select the Jump to link.
4. Answer the general questions about your business (or select Edit at the work summary screen).
5. At the Business Income screen, select General Income.  See the sample screenshot attached.
   

Your business expenses related to the income will also be entered on Schedule C.  Select the
Business Expense section from the selection of sections related to your self employed business.  See sample screenshot attached.