Scotlandtb - I'd go to results.active.com and search by sport 'triathlon' that'll get you a good list of races to start from. Some races lists splits (the times for each section of the event) and some don't so you'll want to do some looking.
For a first race, I suggest setting a few different goals. The first one is just to finish, and then make them better from there. You can do well in one section of a race, only to lose time in another (i am not much of a runner yet)
I forgot to mention that Olympic is also often called international distance.