In my humble opinion the investment of some time a bit of money in having some one on one coaching is vital.
I am an older guy, 61, but I love to paddle and I love to paddle long distance if I can.
A couple of years ago I booked some time with Pete Dorries when he was on the Sunshine Coast. I didn't want to be part of a group and wanted some specific points targeted.
Suffice to say, he taught me some strokes to target long distance with minimum tiredness and economy of stroke. I have kept up his pointers and whilst I am no world beater can paddle as far a I want with comfort.
If you are considering it I say do it! Find a reputable and experienced coach and get some pointers to suit what you do.
You won't regret it.
This is not a paid advertisement nor am I associated with any group.
Good luck.
ET.