I agree with Ken here.
You can certainly get into the footstraps in any order that works for you, but I think going in BFF (Back Foot First) is as Ken suggests, something that sailors with lots of wind, smaller sails, and smaller boards tend to do.
It's not "right" or "wrong", but I think Ken hit on the "crux" of the issue.
If you go BFF, you leave yourself a bit more in jeapordy of getting "tossed" as you don't have the support of your front leg to prevent "trips over the handlebars".
So I advocate FFF (front foot first), but I to have found occasions where BFF seemed to work better. Normally this was with sails < 5.0 m2 and boards < 100 liters.
Hope this helps,