Yay- Starfish is joining the clan!
I did 3 sprints this summer, and I was by no means sprinting during the events (ok, I was- but my idea of a sprint has nothing to do with me actually moving fast). Don't let the word sprint scare you. There are people who are out there for less than an hour and those who are out there for 2 1/2+ hours. Chances truly are very good that if you train properly, you'll certainly not be last!

If you go to www.trifind.com, it has tons of races listed by state. www.usatriathlon.org also lists events. Check them out and see what races are near you.
I'd definitely do a few shorter tris before doing a half. Just because during those dress rehearsals you work out all the kinks and get a good routine established. My first couple tris were a bit of a learning experience, and really helped me get better at transitions, nutrition and pacing.

I'm SO excited that you'll be joining us for all the fun- they really are the most addictive thing I've ever done.