imported my own car model to use for car tutorial

Greetings and salutations I'm working n building from max to unity and the first game is going to be a racing game since i can build everything a lil faster and the turt is a great help with doing so but i imported my 3d model car and having problems understanding the collision technique on applying it to my model to run like the tutorial model any ideas any help thanx in advance sinsir

give your car model a collider and make sure all of the geometry in your level have colliders also. if you want to use a script on the collider, 'trigger' needs to be checked.