Hi imoutthere.
I agree with the advice the guys have given you.
If you like your current board leave it as a shortboard.
If you've got a high volume board you don't need then maybe add a track box to that to take a foil. But way up the cost. I'm guessing at least $200. Au. Which may be better to go towards a foil dedicated board. Some shapers can make them quite cheap in price anywhere around $500. I would choose a shaper that understands & preferably rides foilboards. Otherwise a production board that can have a higher cost.
Anyway. As a learner & a very average surfer. Far from aggressive more a cruiser carver style. I have learnt that you can either make it hard or easy for yourself.
Yes. Getting towed behind a jetski or boat does help but if you cannot find someone to get towed it doesn't matter. Just find some small easy waves & your set to practise. And whitewash is great too. You don't need a drop. Just make sure the whitewash is travelling over deeper water so your foil doesn't hit the bottom.
Just remember. A foil loves to sky rocket. So keep the nose down when catching a wave, getting up on the board & riding until you are ready & steady enough for lift off. All it takes is for you to either put weight on the tail or weight off your front foot & your board will rise off the water.
But as it does you need to level out again by leaning forward or pushing front foot down. Do it immediately! Making the board head back down is better than letting it skyrocket as your ride will be over. When the board hits the water again from a low height means you can keep on riding as normal & try the lift again until you get the feel.
Left & right balance I find is the most difficult when learning & can be the most dangerous. So if you are going to fall sideways, bail out well away from the board!
If you breach the surface you will nose dive & expect the foil to come at you from behind! I have accidently hand caught mine many a time when guarding my head. Lol.
Things I have found when foiling is that I can ride my board just like any other normal board as long as I keep the nose down. And then, when I want, I can then just give it a little lift to turbo charge its speed & then lift higher & level out to fly.
With the right foil you will learn quick. For me it was about 4 two hour sessions in a month. And about 2 months for consistant rides. But that was on amore difficult foil than I have now.