Rank would be your paygrade. You will be an E3 or CM. I am an E7 or CPO.
See here
http://en.wikipedia.org/wiki/U.S._Navy_enlisted_rate_insignia
Rate is the job you have, there are lots of them. ET, FC, GM, TM, IC, MM, GSE, STG. STS, GSM, ect....
Your job as a CM is:
CMs maintain heavy construction and automotive equipment -
buses, dump trucks, bulldozers, rollers, cranes, backhoes, pile
drivers - other construction equipment and service vehicles. They
work on gasoline and diesel engines, ignition and fuel systems,
transmissions, electrical systems and hydraulic, pneumatic and
steering systems.
Fubuary in Great Lakes is pretty damn cold. And the wind can be pretty fierce. You will be provided with warm"er" clothes to wear......and if you want your ass chewed out by everyone in sight all you have to do is put your hands in your pockets to get them warm
Living on Base in Boot Camp is not like a college dorm. After Boot it gets a little like that. The longer you are out of Boot the better you living accomadations will be.