Hi dvasques
Can these people not get you a current Portugese translation? It says it is run by the Spanish association, but to play with Portugese teams, you would think they would have it also translated.
LNFA 2 - Wikipedia, the free encyclopedia
Maybe ot would save you a lot of work... Or the Spanish one (not knowing the languages, I don't know how different they are).
As for your questions:
I agree, A can only block after they are elligible to touch the ball, Two_Flakes summed it up nicely.
I agree, the A player OOB is only made elligible after it touches a B player or official. Touched by an A player does not change the status.
Good luck!