If you are "so beginner", starting out with a car as well as the animations required for transferring control of the player object from the player to the car is not something you should be doing right off the bat. Take the time and learn Unity, and before you know it, you'll know how to do something like this on your own. This question is way too broad to be answered here, though.

@SpikeX.I just answered this question here. http://answers.unity3d.com/questions/10884/how-do-enter-car/10885#10885. @stefan Please do not double post questions even if you don't get the answer you want. Add more details to what you need/want in your original question.

ok but thanks anyway

Yeah, it's his second duplicate of the same question: http://answers.unity3d.com/questions/10985/how-do-enter-can-in-the-easy-way-closed

@stefan - go read this Answer on How to Learn Unity: http://answers.unity3d.com/questions/4897/how-can-i-start-learning-unity-fast. I understand the language may be hard - but you need to write your own programs somehow. People are not going to write your programs for you.