first off- good job on joining the service!
now my biggest tip of advice - wait just to see where you will be, what you will ACTUALLY being paid, if/when you can have a car.
FYI- i was in about a year before i allowed to drive a POV (you can try to hide it, but most training commands won't give you tags unless you have a written statement authorizing you to have a POV, so no approval = no car on base)
E-4 took me year and a half, and that was considered fast, E-5 in 3 which is highly uncommon...expect to wait and work for rank
I'm an E-5 and i'm still contemplating whether i can afford an SS, and i'm better with my money than most.
So thanks again for joining, wait to see whats going to happen after boot. and then get your camaro!