I am also just learning and had my 2nd real session on the weekend. I got my wing last year, my board just arrived last week. So I had quite some time trying the wing with my ISUP. I admit it is rather slow and boring but I had enough time to practice with the wing as the SUP is so stable you don't have to think about it. (my 6.0, 144L feels rather small)

I use a foot leash for the board and did not have problems with the leash, I also use a lifevest so I don't sink to much when falling. And I try to fall to the rear of the board. I just need a longer leash for the wing - not long enough when you are on the wrong end of a 7m wing.