These tutorials are made for 3ds max users. This will show you how to make a flat track and how to put it into the game. Pls watch all the tutorials before jumping ahead or you will more than likely do something that will make ypu have to redo something. Enjoy!
https://www.youtube.com/channel/UCOObcTOLkeYlkoRaDkz8Biw
Make sure you watch them in order
First Vid: Getting Started