The best way to learn C-Script is to play with it and use it, I would strongly suggest buying it, if you are ambitious and think that someday you might succeed in making a successfull game, then it's totaly worth it, if you are just trying to have fun, then it's up to you.
MY mother bought me Gamestudio Standard (A4) for my birthday a long time ago (I was 15, now 20 and have GS pro A6 6.40), and i'm glad she did because it is virtualy imposible to become bored with it, and it has great potential. It took me a long time to learn the WDL (which is just about the same as C-Script) but ONCE you do, YOU are in the zone and can practicaly make ANYTHING!
I have'nt made any complete games, just played with it to learn, but i'm working on "The Big One" right now which is a paintball shooter game (I will be using no template scripts, all from scratch), infact, its the reason why I got A6 pro.
Go download that trial version and see how ya like it, I really think you will!
- Vonman
P.S: Welcome to the club :-D