I'm so glad that you've found Terraforming Mars! It's a wildly popular strategy game with a lot of depth, tons of replayability, and it is full of theme. You're in for a treat...
Start off with *link* *learning the rules*, then read about my *first thoughts for new players*, and you'll be ready to start focusing on the full-fat strategy and tactic sections surprisingly rapidly.
-first thoughts should include how points are scored, and the basics of playing a reasonable game