If you go with a Horue foil, I recommend their LW wing. It gets me flying with 1.5m less sail size than regular windsurfing. I'd also recommend the LP Foils as another good choice.
I recommend learning to foil without straps and not hooked into the harness. This will allow you to safely jump off when the foil ride goes wrong. The board sails clear of you, when you jump.
The second phase of learning is using the harness. The harness helps to stabilize flight altitude. Just don't use the harness until you gain some flight skills first!
The third phase is using straps. Straps increase your ability to control flight, sail power, and drive upwind at higher angles. You don't ever have to use straps if you prefer strapless. The sail pull is much lighter than regular windsurfing.
I'm currently torn between the freedom and joy of strapless, versus the slight increase in wind range using straps. My boards will continue to be designed for strapless and strapped use.
Here are some early videos that show us during the learning phase. Foiling on a windsurfer, strapless, unhooked, is much safer and 10 times safer than learning to foil on a kite. The sail tames the beast. The ability to eject at any time has actually made hitting the eject button a fun part of learning.