How to start simracing: http://www.rockpapershotgun.com/2012/02/15/off-to-the-races-breaking-into-driving-sims-part-1/#more-94546
Basics of real and simracing (from iRacing school):
1: Intro
2A: Vehicle Dynamics
2B: Vehicle Dynamics
3A: Fundamentals of the Racing Line & Cornering
3B: Fundamentals of the Racing Line & Cornering
3C: Fundamentals of the Racing Line & Cornering
4: Using Your Eyes
5A: Braking Technique
5B: Braking continued
6: Downshifting
7A: Race Craft & Passing - Understanding Race Craft
7B: Race Craft & Passing - Technique
7C: Race Craft & Passing Etiquette
8A: Race Starts - Surviving Turn 1
8B: Race Starts
9: Pre-Race
SHAKEDOWN - The Racing Line Explained