Taxes as a newly self-employed independent contractor

I am a newly self-employed independent contractor established as a sole prop.  I did earn a paycheck via employment, in which taxes were already deducted, for a short term at the beginning of the year.

 

1)  From what I read online, I understand that I should pay my taxes quarterly.  Is this accurate?

2)  How do I go about doing that?  Can I pay them quarterly via TurboTax using my already established account?

3)  What forms do I need?  Assuming I can use TurboTax, will I be walked through step-by-step?

4)  In general, I need all the guidance I can get on this.  I have no idea how to approach my taxes, how much I should be paying, how much to put aside, etc....all the things!