+1 with john.
Especially if you are somewhere where there is a station, even if it's not your job, help out with the station duties. Be willing to cover for someone if they are going to be late for 10 minutes ot need to leave 10 minutes early. We have to have each other's backs in this profession, and when you do something for someone else, they'll remember it and pay you back later.
At one of the firehouses I'm at, there was a gentleman in medic school and everytime I was on after he was, I came in a half hour early to cover for him to make sure he could get to his class on time. Sure, it meant I had to get my *** out of bed 30 minutes earlier, but I could take naps if I got tired and there wasn't really any reason not to. He's remembered this and to this day, if I need to find a replacement for any reason, he'll either find someone for me or take it himself, even if he needs to call in a sitter. I've had incoming crew members clean off the snow on my car for me, probably because I always help out with station duties even though it is not in my job description to do so.
If you're working at a typical firehouse, you become best friends and brothers even, with the guys you work with, so make sure you start off on the right foot.
Good Luck at your new job!