I am a South Carolina fan, and also an attorney by trade. South Carolina came into the SEC from the ranks of the independents the same year that Arkansas joined.
I am looking forward to having A&M in the SEC.
With that said.....absolutely EVERY WORD THE ARKANSAS GUY SAID ABOVE REGARDING THE SEC IS TRUE. We had our own "culture shock" in SC when we joined. Ohh, the fans of the various schools are all congenial enough. (well, except Bama people who will be happy to taunt you even if they are up by 40)
EVERY school you play will rountinely bring 12-15 thousand of their fans to your stadium.....There will be 12,000-15,000 fans that are not "you" EVERY single Saturday. If you are not used to that....get used to it. It IS coming. Everyone travels WELL....except possibly Vanderbilt....and even they will show up with 5-7,000. This "t-shirt" thing he mentions. Also VERY true. Probably 40% of all fans you will deal with really did NOT go to school at the various Universities.
The SEC is a LOT of fun. The fans of the various schools are also a lot of fun. They are great to party with and love to tailgate. (LSU people will come two days early....never will forget the LSU fan from when they were up here about four years ago that WAS PARKING THE CARS when I pulled up in my motor home...I asked, "how are you doing the parking"? His answer, "I have been here since Tuesday and they hired me."....TRUE STORY) You will meet, and deal with....LOTS of fans from all the schools....Each group is unto themselves. (Ole Miss is the most "civilized"

The first time you have 20,000 LSU fans show up you will find that THEY are their own breed.....the hardest partiers you will ever meet.....great fun....just don't try to match them shot for shot. (I think most of them start doing shots shortly after birth)
The SEC is a very different animal. I think A%M and the Texas culture matches the "football is religion" approach of the SEC. But, make no mistake, the people you will see starting in (apparently) 2012....some are EXACTLY like the Arkansas guy describes.....the kind that will kill your prized oak and then call to brag about it. (the Auburn story) (Fortunately, 80% are a lot of fun)
I WILL promise....The SEC fan (even Ole Miss)is never going to be accused of being "polite tea sippers"...(by the way, we make fun of UNC up here for that same sort of thing) The crowd you have coming (regardless of which school they are coming from are more likely to be chugging a bottle of Jack Daniels than sipping tea.
I look forward to A&M being one of us. You will enjoy it. But there will be a culture shock when you discover, like I did years ago, that "these people (from the SEC schools) are Damn serious about football.....and there sure are a LOT of them" Welcome.