New job any advice?

Yesterday I was offered a job in a step down unit. I was told from there I could train and join a critical care unit later on. I accepted because it is an opportunity I've wanted since I graduated from nursing school. I'm a little nervous because I've only worked Med-Surg and ER, and because this place I'm going to be working in is huge! The amount of beds in this one unit equals the amount of beds in the whole hospital I've been working in. So does anyone have any advice on what to expect and what I should try to review before I start working? Any good critical care reference books? Thanks, your help is appreciated!
This is a situation where, having been there, it's best to just start the job THEN decide what things you need to read up on. You are going to do great - they wouldn't have offered it to you if they didn't think you were capable. Just wait on the extra reading etc. It will make your stress less and confusion disappear. Enjoy!