I think we need to start a New England "new mini moms support group"!! I suspect we are all going to have a lot of the same questions.
Of course I am not an expert, having only had the one foal who is now 2 weeks old, but I think you want to hold off any "imprinting" until the mare has had her turn. The day after Max was born, once we saw how good his mom was doing, we carefully started handling him all over, etc. Mom was protective but not overly so, and did not get upset with us handling him. Max seems to like us handling him all over and even lets us pick up his little feet.