Triathlon 1st timer help

Hi I am doing a tri-a-tri in June, Its basically a 200 meter swim, 20 km bike ride and 2 km run... I have never done anything like this before. I am pretty athletic right now I play soccer and hockey, and I do a spinning class 2x a week and swim at least 1x. I hate running, but will be starting to add that in also ... anyone every done a triathlon before or a sprint tri? Can you give me any tips or advice? I'm a little worried because I only have a mountain bike and I know you go much slower on them... I would like to do well in my first race so maybe I will be inspired to do more...
any help is appreciated!

Here's a link to a site that has a lot of useful information.
http://www.trinewbies.com/index.asp

Mountain bikes are fine for your first tri but you're right they do slow you down compared to a tri or road bike. Even hybrids are better. I did my first Tri last year and borrowed a friends hybrid and it did ok. The other thing you might want to look at is renting a wet suit, unless you like cold water. Make sure you read the rules about transitions. For your first one you don't really need a lot, you should be looking at whether or not it is for you. Enjoy yourself. Everyone is very friendly at these events.

Good for you! I've been doing tris for a few years and love it. I hope you do, too.

Someone else mentioned the trinewbies site. That's a very good site. Excellent recommendation.

The first tri I ever did was similar distance to yours. All I did regularly for exercise was walk and ride my bike (a hybrid). 2K is just over a mile, so if you can't run the whole way you can still finish in a reasonable amount of time if you walk. Since you have a mountain bike, I suggest that if they have a mountain bike or fat tire category or even a first-timer category, you consider signing up for that rather than your age group. People in the age group categories will probably tend to have road bikes or tri bikes and they will fly by you.

Which brings me to my second suggestion: make your primary goals finishing the race and having fun. It's much tougher to have fun if you're all wound up about what place you finish in.

When I did my first race, I got advice from my brother, who was a very experienced triathlete. The best piece of advice he gave me was to do at least two bike/run brick workouts before the race. To do this, ride your bike for approximately the amount of time you'll be riding in the race. Then jump off the bike, change into your running shoes, and hit the road for a mile or so. The other piece of advice he gave me was to put my swim goggles on first, then put on the cap. There is a lot of contact in the swim and it's not unusual to get kicked or grabbed by other swimmers. Your goggles could easily get kicked off. If the strap is under the cap, they won't fall off completely. Trinewbies probably has a lot of info about transition set up. It's important to be a bit organized so you don't waste time in transition.

Be prepared for the swim. There is a lot of contact and it can be intimidating. It's okay to swim any stroke and if you need to tread water, that's okay, too. It might also be intimidating to see the distance of the course all laid out in straight lines. 200 meters or 400 meters doesn't seem like much in a pool, but I've heard people at races get a little intimidated when they see it marked in a lake or ocean.

Above all, just have a great time!

I also just signed up for my first one( sprint tri) and am mentally freaking myself out about transitions, not feeling prepared, ect. Im trying to remind myself its just to push myself and have fun but it's not working. We only have 7 weeks to train.
Here's to hoping I don't drown.