For me, it was bicycling first, my first love of exercise, ever.
Then discovered after a full season that I can run for an hour, then decided I want to do a tri - a sprint - had to learn freestyle swimming over the winter.
I would recommend loads of bicycling, most easy (base building), some climbing or fast riding.
It all depends on what you want to do - sprints or Ironman or anything in between, and how long you can be patient.
Basically, for a sprint, you do not need a plan, just be able to cover the individual legs, train each discipline at least maybe 2x/week, and have enough base endurance from cycling for the entire duration of the race.
By reading up on old posts you will see how the others did it.
With running, the general philosophy is mostly slow distance runs with some intervals later, when you can cover the distance and want to improve speed. Good form is important too for injury prevention.
Swimming, in my not so humble opinion a class or private lessons are essential to master technique, which will make for 90% of your performance. Took me over a year to say I have a decent technique.
Then, do some bricks to know what the bike-run transition feels like, and master open water swimming without fear.



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It feels good to have someone else just starting out!