I havent started watching the show yet so can someone kinda give me a little background info?

well the lead charicters are called. Catherine Willows she now the first in command before her was Gillbert Grissom but he left half way season nine. Sara Sidle also left near the begging of season eight she and Grissom are romannticly linked and have now gotten married. Nick Stokes and Warrick Brow are the men of the show. warrick was killed at the end of season eight. Greg Sanders used to be a the lab's DNA technition but he worked his way to becoming a filed CSI.
i think that mostly what you need.
hope it help. i don't mind you asking me any more questions about the show i'm knid a real big fan so i know mostly every thing.