Self employed

I am contracted out for work and get paid directly to my bank account without any deductions. Is there a form I can fill out to show proof of income for the purpose of court? How much do I have to make self employed to report to IRS? I also provide dog boarding services and they store all payments on an app called “Rover” I believe they offer the 1099 app, how much do I have to make to report to IRS? As you can read I am self employed AND have two sources of income.