Whats the minimum amount of years can you sign up for? I was thinking about joining the marines.

Small Answer-- See a recruiter.

I think it's still four years minimum. Although if you're reluctant to give up four years (which sounds like it might be the case), might want to look into the Marine Corps Reserves. It's a good way to "try out the Corps" before committing to a full tour or career.
http://www.mcnews.info/mcnewsinfo/marines/features/understandingreserves.shtml