Hi Alex.....Grigory is a really good friend of mine and he's and giving you great advice.
I just saw this thread. I actually sell a lot of SS foil gear and the Infinity 76 in the F-surf package with 4'6" dwarf is perfect. One guys said a larger board for learning? Maybe for your first few sessions, but once you learn to foil, the 4'6" is perfect and larger boards will feel really big as you progress.
The infinity 76cm does have a lot of lift which means it will want to foil quickly even at slower speeds, but it also has a very impressive top end for a wing like this. It's my best selling package and wing by a long shot.
Here is a breakdown of your sessions and potential kite sizes.
1) For your first time ever, pick he same kite size that you would use to get up on a twin tip and maybes just a tad smaller. Your goal day one is to NOT foil, but get used to riding the board with the foil ON the water and figuring out how to keep the board skimming along nicely and in control. No foiling. You should be able to ride hundreds of yards both directions standing on the board. Very little edging and even front and back foot pressure with more emphasis on the front foot when needed.
So you really want to go SLOW. Picking a kite big enough for riding a twin tip will let you dive the kite and then just let it pull you and you can actually go slow this way. Sheeted out a fair amount. If you have access to a 15" mast, grab one. It will leak the first few sessions easier, but a 24" will work also.
2) When you are starting to foil, the resistance will reduce a lot, so you can now go down one kite size. The Infinity 76cm actually likes to be ridden 2 sizes smaller at times, but not quite yet. You're learning to foil, but again, keep your speed down.
3) Once you learn to foil and can ride longer distances above the water, you can probably go down 2 kite sizes, but be careful to not go too small. Quick kites means having to have better foil control when working the kite to get going.
Grigory is also correct that having 2 wings ultimately will help. Smaller and faster wing swill let you actually handle overpowered conditions a little better. Bigger wings will feel overpowered a little quicker. Start out with 1 wing though and go from there.
I hope this helps. I do sell all this gear and can help if needed, but if you have a good local dealer, support them. They will appreciate it.
I get to ride and test a lot of foil gear and have access to a lot of carbon set ups, but i still ride the SS F-surf package more than any by a long shot. I do switch my front wings a lot depending on my mood (jumping, strapless, etc) and love the modularity of this system.
I hope this helps and good luck.