you'll want to put aside 15.3% for your self-employment tax. That is no more than the SS and Medicare withholdings that would occur if you were a W-2 employee.
then for the income tax, it really depends on how much you are earning. easily 12% tax bracket and could be higher. You may want to use this website to estimate your earnings for the year and then you'll know how much to put aside.
https://www.dinkytown.net/java/1040-tax-calculator.html
