hello i have started to plan game in unreal advanced vehicle. There is that one car for ready, but how i can replace that for my own car dodge challenger. so how i can make my car for example skeletal mesh that i can add that to game mode?
You will have to rigg your mesh in a 3d program. After that import it and in the vehicle blueprint you will have to replace the skeletal mesh with your own one. After that recreate everything that is needed to play with the car (e.g anim bp,…) 
Some useful information:
(will teach you everything about animations and characters/skeletal meshes)
okay thanks. is there easy guide to how to rigg your mesh in 3ds ?
Here is a 3ds rigging tutorial: ?v=XVB9W6xhBcs + this tells you the important stuff that you have to keep in mind when you create a rigg for a vehicle: https://docs.unrealengine/latest/INT/Engine/Physics/Vehicles/VehcileContentCreation/index.html