TurboTax will help you estimate your 2020 income and prepare your vouchers based on your estimates. The TurboTax FAQ I'm linking below will instruct you.
How do I print estimated tax vouchers for my taxes?
However, if you want to be more specific, you may want to look at the IRS Publication I'm linking below. There are worksheets in the publication to help you better pinpoint what your estimated tax payments should be. Additionally, there is a worksheet that you'll need since you'll be considered self-employed. Here's a link to the publication.
https://www.irs.gov/pub/irs-pdf/f1040es.pdf
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
