The above suggestions are good.
Also search youtube for "Chris Grainger". There's some good videos that explain some of the basic setup and tuning on a touring car.
The "XRAY T3 Set-up Book" also has some useful information, and can be found here:
T4 2014 Specs
If you're on iOS or Android, you can get Martin Crisp's app (forget the name) that has in-depth information on setup.
But keep in mind, it's easy to overwhelm yourself with information about setup theory and such when you're getting started.
In order of importance:
1) Learn how to build / prepare the car properly. Static weight balance, making sure things are moving free, trimming out steering, removing tweaks, saucing tires, etc. As long as the car is prepared properly, and there's nothing cranked to 11 in the setup, the car will drive pretty well and be decently fast.
2) Learn to drive consistently. This is the hard part.
3) Get a clear idea of what the car is doing, and what you want it to do differently. This is the even harder part.
4) Then learn how to make setup changes to accomplish what you want.
Your most valuable resource is all the great people at the track! They're especially helpful with #1. Sometimes having someone experienced go through your car for a few minutes will spot basic issues. Or handing them the transmitter for a few laps will identify major handling issues that are easily fixed.