Congratulations on the place, just a quick post to say good luck, I had such a pang of jealousy when I saw this thread had started as I was part of the vlm 2012 newbie thread. You will love it!
These are the things I wish someone had told me ( may be you know these things already)
Get good socks early
Listen to your body, if it hurts stop and get it checked out training for 26 miles is very different to 13 miles, getting to the start line is 95% of the battle.
Practice your rehydration/refuelling strategy early on as many people can't get used to the gels
But whatever happens you will have an amazing experience good luck