Problem of making multiplayer split screen car racing game

I want to make a multiplayer split screen car racing game.
I have two problems.
I am using Unity 5.6.1f1
Problem 1:
I added the car by using Assets → Import Package → Vehicles
The car works in single player.
However, it is not possible for me to make two cars with different inputs. They must using the same input no matter how I changed the input setting . The cars must be using the same input.
How to make two same cars with same speed but different inputs. (e.g. car 1 only use arrow keys to move and car 2 only can use w,a,s,d to move)

Problem 2:
Also, I want to make split screen to display 2 different cameras in the same game. But I can’t find any multiple player split screen from asset store. How can I make split screen ?

I am a new user of unity and I don’t know anything about coding. Please tell me the full version of the useful codes , tell me what should I name the code file, where should I add the file. Thanks.

Stuffs in my project:
Standard Assets\Vehicles(Only the things of the official unity car)

This is incredibly easy. Make a 2nd camera. Change the ‘Viewport Rect’ of the first to Y 0.5 and H 0.5. Then change the 2nd cameras ‘Viewport Rect’ to Y 0 and H 0.5.

A H (height) of 0.5 means that it takes up half of the available screen height.
A Y (Y position) of 0 means that it renders at the bottom of the screen. 0.5 means half way.

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Thanks, it’s 100% works