New to the site and to Triathlons

My name is JT. I'm 28 years old from Utah. I have my first triathlon May 10th, in St.George Utah. It is a sprint (Swim 750m, bike 13 miles, and run 3 miles). So far I'm really impressed with this site. I have a twin brother who talked me into training for a Tri and now it has started to get addicting and I haven't even competed yet. I'm excited and hope that I don't drown in the swim. Just kidding! I here there are a lot of boats.
I've received some pretty good advice here already and am ready to step up the training and hopefully get through my first one.

My training right now is mixed with dedicating time to all 3 aspects and mixed with some circuit training. I'm 5'9 about 172 lbs and I'm trying to drop down to 160-165 to get the fat off and then put on some lean muscle.

I'm aways open for any advice that anyone has and hopefully will be able to make some friends on this site..