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Mucel said..
Thanks. I think I will use my 8 feet windfoil board for the first steps and then change it if everything goes ok with my shoulders and neck. I already made install on it US box tracks for windfoiling, so I can advance the foil up to 45 cm from the tail.
Then I will buy first the wing. Which is approximately the maximum wind strength I could use the 6 m2 as a 70 kg beginner?
It depends on what model/brand of wing. All 6 m2 wings are not the same. I have my 6 m2 out in up to 20 knots, but then I will go down to a 5m2 or even 4.2m2 if the wind continues to pick up and stay above 20 knots. More importantly is the low end, I can start winging when the whitecaps start showing (~12 knots) combined with a large foil (1850cm2).
Going back to your original question, in 12-15 knots you will struggle with a small wing. Yes, there are always guys who claim to use a 3.5/4.5 in 12 knots, but they are not beginners.
I find that intermediate and advanced guys forget very quickly what it was like to start and how much finesse they have compared to beginners. Life will be very frustrating for you on a small wing, board and foil in the beginner stages. More power, float and lift (up to a point) is your friend in the early days.