Yes, a student can join the Honors College after getting a 3.3 GPA. I think you can join after the fall semester.
However, if you don't start in honors housing, you can't get in honors housing.
I would suggest starting in Ridgecrest South...the non-honors side.
And...just to let you know, it's more difficult for returning students to stay on campus because there isn't enough housing. Frosh have to be on campus, so only a limited number of returning students can stay on campus year after year. Usually the NMFs who are given free housing are the only ones who stay in campus housing year after year.
During your first year, it's a good idea to find some friends to move off-campus to one of the nicer apts that are close to campus. My son will be at The Retreat next year which is on the Crimson Ride route.
The Retreat is even nicer than the dorms. It's actually like a resort...no kidding. http://www.retreatalabama.com/