Very briefly:
You are the business. You are a business who is doing contract work for another company. Your business activity is reported on a schedule C that is attached as part of your tax return. Schedule C lists your gross business income, any expenses, and calculates the net profit. The net profit flows to your main form 1040 where it is combined with your other income and deductions. The net profit also flows to Schedule SE for calculation of self-employment tax (a version of social security and medicare tax for self-employed people).
You need to start by indicating you have small business income so the program will set up a schedule C. This will happen if you enter a 1099-NEC, and will be an option if you enter a 1099-K or 1099-MISC. You can also start a schedule C for a small business without a 1099. Your business name can be your name. The tax number is your SSN (if you did not apply for a business tax number, you use your SSN). This is where you will list your business income, and any expenses like mileage.
