Need a Timer Script

Hey again guys, Now that I fixed the problem with my movement on myself, I need just one more thing. Because my game will be a racing game, I need to have some sort of timer score based script. What I mean by this is that I can set the time for each difrent level, and that the car((A Cube)) Needs to get to the finish before that time runs out. It should also show to to beat time on the Screen. And I have some more questions. 1. Is there a way to create text in game, so if I press like "H" It says: "Insert Text Here". 2. How can I set an Objects position, so that I can make a reset button.

Thanks anyways! ;)