Sharron tri my first

I've never done one but I swim at umass boston about a mile to 1000 meters 3 to four times a week, I run every other day and can hit 8 miles at a 7:30 jogging pace, and ride upto 28 miles at a average speed of 15.5 mph and 12 miles at 16.6 (44 min flat) on a mountain bike lol, Oh yeah did I metion I just quit smoking cigeraretts a month ago after ten years. So what do I need for this I.e. wet suit helmet etc.. I'd like to find a tri bike for cheap if anyone has a left over I already registered as a newbie and will hit the course with the mountain bike if need be but think I could win the newbiee field if I had a faster bike