Hi glad to help!
I will include several links that may be helpful for you in the future. General rule of thumb is to pay 15.3% of income. This is the Self-employment tax amount that is due quarterly. Self-employment taxes are Social Security and Medicare taxes. The IRS website may be "janky" at times but it is definitely better than snail mail. You never know if or when your payments will arrive at the IRS. If the IRS doesn't receive the payments timely they may assess a penalty. Here are the links to help you estimate the quarterly payments:
https://turbotax.intuit.com/tax-tips/self-employment-taxes/a-guide-to-paying-quarterly-taxes/L6p8C53...
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...
https://turbotax.intuit.com/tax-tips/self-employment-taxes/tips-for-paying-estimated-taxes/L1nDU0sUs
