dodging games

Hey guys, i'm pretty new to this whole Alice environment so i got a few questions.

I'm trying to make a sort of dodging game.
I have a car and 3 lanes on a road. Now i want a random object from a list apear at random intervalls and when the car hits one of those, i want to deplete a life from the 3 lives you get.
Ill give you my progress so far.
If you have my solution please tell me, or edit my file and send it back
Oh and i sort off need this monday.

Help is much appreciated.
RainwormNL