For your first one, concentrate on being able to do all the distances on their own without too much discomfort. You'll be fine on race day that way.
Training plan will help structure it, but don't be scared if it looks too much, as a beginner just keep in mind the above advice and adapt the sessions so you can get to the goal.
If you want to race (compete not complete) you'll need to put more graft in, unless you're gifted and have strong background in the 3 sports anyway!
For your first one, concentrate on being able to do all the distances on their own without too much discomfort. You'll be fine on race day that way.
Training plan will help structure it, but don't be scared if it looks too much, as a beginner just keep in mind the above advice and adapt the sessions so you can get to the goal.
If you want to race (compete not complete) you'll need to put more graft in, unless you're gifted and have strong background in the 3 sports anyway!
Good luck.