Here's where you need to start:
The ID this generates is like your signature: apply separately for yourself, your spouse and your student.
You'll need your SSN or alien registration number, drivers's license number, W-2s, 2018 tax returns, records of untaxed income, records of assets and a list of up to 10 schools your student is/will be/might be applying to. It's totally okay if you list a school your student does not apply to! Or if they apply to one you don't list; you can add it later.
The FAFSA is here.
Colleges get this information directly from the FAFSA, so getting your application in early is best.