I recently became an ebay seller. I'm hoping to turn this into a business. I'm not making much money at the moment. Do I need to file taxes yearly or quarterly?

If you have self-employment income for which you will pay self-employment tax for Social Security and Medicare.   You will need to use online Premium software or any version of the CD/download so that you can prepare a Schedule C for your business expenses.

https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes

https://ttlc.intuit.com/turbotax-support/en-us/help-article/form-1099-nec/1099-nec/L5qTsBiSe_US_en_US

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/26653

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://blog.turbotax.intuit.com/self-employed/self-employed-tax-deductions-

calculator-2021-2022-50907/

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs

https://turbotax.intuit.com/tax-tools/calculators/self-employed/

Briefly:

You file one tax return per year, regardless of the kind of business or amount of income.  However, you must make quarterly estimated tax payments based on your income for that quarter.  If you over-pay your estimated payments, the difference comes back as your tax refund.  

You would owe income tax on your net income (gross income minus expenses) and also owe 15% self-employment tax.  So your tax payment should generally be 27%-37% of your net income after expenses, depending on your other income, dependents, marital status, other deductions, and so on.

Your business will be reported on a schedule C, which reports gross income, expenses, and calculates the net taxable profit.  This income flows to your main tax return where it is combined with any other income (wages, prizes, pension, etc.) and your personal deductions and dependents, to determine your final overall tax liability.