Team in Training

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I have registered to train for a Team in Training half marathon. It's my second attempt and my main concern is the fundraising although the training itself does mak me a bit nervous. Has anyone else ever done anything with TNT and what did you think? Also you should know I'm NOT a distance runner..... The most I've ever run consistently is 1 mile.... 13 just seems crazy!! But I've never committed to or accomplished anything I've started so it's important to me to try... Especially now that I seem to have plateaued with my weight loss and seen a great dip in my motivation.

Thoughts???