Hello again. Here goes:
Just one story flaw please, thank you.
Yes, I'll handle those stats and the stats of your raven form.
No, I do not think so. Those are rules for Bjornaer and maybe Shapeshifters, not skinchangers. The animal form comes from a 'spell' cast by an item. In fact skinchangers cannot harm a person under parma for that reason. Warping does accrue, so no a good idea.
Falcons do not usually attack ravens, they are roughly same sized birds. Both the companion and the magical animal have enough magic to be safe from tamed falcons and most wild ones, especially since they will be able to communicate with them. Eagles are another matter...
Yeap, preferably privileged upbringing (that would allow you 50 points on Martial, but no more from general points in them). Warrior is more open yes.
Ok, hold on now:
a) A Companion must be able to support herself somehow, spending an average of 2 seasons on that. This character can use Hunting, Animal Handling, Falconry or something else. Pick one. (You do not need 4+ for this)
b) Depending on the choice above, she might also count as specialist or laborer bringing covenant costs down. Falconry counts as neither of those. Hunting/ Handling is laborer (You do need 4+ for this)
c) Making an income for the Covenant is an entirely different matter. Do not confuse it for personal income. As noted it will take much time to cultivate such a thing.