You can read through the posts for trianing tips. A good website is Beginnertriathlete.com. Slowtwitch.com is another, but more for experienced, long distance triathletes and pros.
For all 3 disciplines. Just start out doing what you can and slowly increase the distance. The nafter you've built a base and can run and bike and swim (without stopping) at least twice the distance you're going to race, then start ot work on intervals ot increase your strength and speed. They don't have ot be sprinting either. Jsut a pace that's a little faster than you plan ot race at followed by a speed that's a recovery. It's oftne easiest to use breating rates or heart rate zones as your guide to pacing.
But you need to do some sort of intervals. Endless miles will yield you 1/2 the results you'll get from directed and somewhat structured interval training. You can get more training 6 hours a week alternating hard and easy recovery days, than you will going for 10 hours a weeks at the same pace. If you have limited time ot train, you "easy" days for your legs cna be swimming days. So alternate swimming, running and cycling. Spend at least 1/2 of your time cycling and divide the rest between swimming and running.
As you geta few weeks away from your race, practice transitions. Also, once you have a good base, throw in a "brick" once a weeks. Where you ride at least 30 minutes then immeidatly throw on your runing shoes and run at least 20 minutes.
For the bike... if you don't have aerobars, get them and work with a bike shop to make sure you bike is set-up and fits properly. A $800 bike that puts you in a comfortable but efficient aero position is faster than a $10,000 bike that's set-up ad fits poorly. Aero trumps weight even on hilly courses and fit trumps $$$ spent every time.
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