At 40k you're fine. This is a secondary site, but it shows that you need to make around $26k annually to sponsor. You far and above exceed that threshold. Check out https://www.boundless.com/immigration-resources/income-requirements-for-green-card/#:~:text=2023 Income Requirments for Green Card Sponsors&text=The most common minimum annual,is sponsoring only one relative.
Yes, you will want to have pay stubs, a signed letter from your employer indicating your position, salary, etc.