Get your taxes done using TurboTax

I just found info directly from the IRS website. I believe I apply to all 3 of these of the rules under the "Who Does Not Have To Pay Estimated Tax" section. They are:
1. You had no tax liability for the prior year
2. You were a U.S. citizen or resident for the whole year
3. Your prior tax year covered a 12-month period
If this means I do not need to pay, then what do I do when filing at the end of the year? This has made things much more confusing for me.