last year I filed taxes based on W2. This year I am getting income as a contractor and the employer will issue 1099 at the end of the year. where to start?

For today, I just want to estimate my taxes, pay it to stay compliant with IRS. I am assuming when I get 1099 I will be able to file my taxes at that time. Is that true? I want to use turbo tax to track all this so that it can be used to submit my taxes at the end of the year.