First year 1099 - independent contractor

Hi, I just start on June 24, 2024 as an independent contractor in California. I didn't pay quarterly tax for Q2 2024 since the deadline was before my start date. Starting with Q3 2024:

  1. Do I need to pay quarterly estimates for Federal income tax, self-employment tax, and California state income tax?
  2. Are the quarterly estimates of income tax and self-employment tax paid together?
  3. What forms do I need to file and how do I calculate the amount?
  4. Where can I file the forms and pay the estimates for both Federal and California tax online? Would you please provide links if possible?
  5. What percentage of the total tax owed needs to be paid in September 2024?
  6. Is there any other type of tax that I need to pay as an independent contractor?

 

Thank you so much! Really appreciate it.