Welcome @jmdcovas
You’ve already seen there are a few different approaches, long and short is that at the start almost any plan consistently followed will achieve results and get you through an ok
olympic triathlon. Even inconsistent, as I am, you can make it work.
TR plans are bike focussed, which sounds like they suit you and the pool situation. As a beginner Id pick one Low Volume and ride outside once a week too to build up those bike handling skillz.
Structured training can become mentally tough to keep at, so I usually have a break and start “fresh” in January for a March/April race. So an alternative might be to do sweet spot base low volume for variety and while swimming is light.
Id agree that when it comes to spending money on triathlon, a swim coach is probably the best investment for performance but also for confidence and enjoyment on race day.
Have fun 