We just celebrated our 1st anniversery yesterday!
My biggest advice is to support your spouse to the fullest. We started our marriage in not the best circumstances (I had lost direction in life/job two weeks before the wedding) but we were there for each other and got through it. Being open with each other is key.
One thing that I kept hearing was how much things would "change" once we got married. We never found this to be the case. Marriage didn't "change" anything for us. The only thing it did was make my family more accepting of us since we were no longer "living in sin"!
Good luck and enjoy every moment of it!