Welcome Julie!
Boundaries should always be about you and what will allow into your life. They are not rules of conduct. Our alcoholic husbands are adults and we are not the parent.
For one thing I will not get into a car with him when he is drinking. Whatever it takes to avoid that is what I will do.
I will not be drawn into a fight or even a conversation when he is drinking. Again, whatever it takes to avoid that is what I will do up to and including walking out of the house.
Be very careful about the "If you...I will" statements because the "If you" will probably happen and if you don't do the "I will" you have lost credibilty.
Hugs,
JT