You must file a form 1040 and enter your W-2 income and your self employment income. The net employment income and expenses are entered on a Schedule C and flow to line 12 of form 1040. The net income from self employment, the W-2 income, and any other taxable income are added together on the form 1040 to arrive at Adjusted Gross Income.
You can use the Self Employed version to make all these entries.
Your occupation is whatever you want to enter on your tax return. It doesn't matter what you enter. Just enter your W-2 occupation.
