Hi user1727! Welcome to the event.
To file your quarterly self-employment taxes, you should use form 1040ES.
Here is a link to the IRS website for estimated taxes.
https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
The best way to calculate your business deductions is to start with your bank statements of deposits and withdrawals.
Here is a link to what you can deduct
https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employed/write-business-expense/L8d...
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