I am putting in exactly what's on my license and Turbo Tax is saying first three characters must be entered. there aren't any other characters to enter!!
This sounds like a NY document number requirement. This is a required input that can be found on the back of your NY license. You can find the number after (not including) "IDUSA." There should 8 or 10 digits, of which you enter the first 3 to satisfy the requirement.