That's a Hard Question.
First; I guess that I would learn as much as I can about them and Teach them about us (Humans) so there could be some understanding.
Second; I would slowly introduce people to them and build a repore.
Third; I would find others in the "B.F." Community that I feel would look out for the best interrest for these beings and build a "Coalation" to Protect them from any Violence.
Fourth; I then would work with that "Coalation" to decide when the best time for a Public Introduction.
It would be a long process, because I would have to get Vetranarians Involved, then Possibly Doctors, Before Having the Scientific Community gets access to them. I would not want to Overload them (Bigfoots) with people. They would have to be willing to accept these people in their lives to help them overall.
I guess I would go at their pace, Not Mine, or anyone elses.