Yeah, you're dink! Get qualified nub!

But seriously, for your question... Treat all the nukes with respect. Most submariners are smart, but almost all of the nukes will be smarter than you. They serve four meals a day underway... Don't wake up for the fourth. Don't forget to bring some tunes to listen to while working out, because we do work out underway. Bring a couple of books to read to pass some of the time. Don't piss off A-gang. Well, you don't really want to piss off any submariner unless they are MT or sonar, but you REALLY don't want the A-gangers to target you, because they are the most likely to actually do something to you.
As for what you'll need to bring... 2 sets of workout clothes, 4 sets of coveralls, 6 pairs of socks, 6 pairs of briefs (or mix and match, just make sure you got some white briefs for 'official' uniform days), 2 white t-shirts, 4 other t-shirts, a bottle of tobbasco sauce, a good pair of sneakers (sound silencing shipmate!), 3 dirty magazines to trade and whatever else you can fit under your bed. Really, it's not that much personal space, but we all make do with what we can during the patrol.
Being on a boomer is pretty sweet. You get plenty of extra room, the food is great, computers with latest games on LAN, no hot racking and some of the best submariners out there. You won't hit your head NEARLY as often as you would on a fast boat. Just get used to the experience, since if you go boomer a sixty day patrol is probably the shortest you will actually see and that one will be the least stressful you will ever experience.