Which form should I file if my deductions are less than the $12,000 standard deduction for a single individual?

If your deductions are less than the standard deduction and you have a simple return you will just file the 1040 with no schedules attached unless you have insurance through the marketplace and need to enter a 1095A. 

This year this is only one 1040 and several schedules attached. 

You should be able to start the in TurboTax Free Edition