I can't answer most of your questions. I haven't bought the property yet and actually haven't even set foot on the place. I'm just going by pictures so far.
Here's a picture along the creek:
Here's a picture of the less wooded area to the west:
The brown areas are cultivated fields and could be planted in whatever we wanted to plant.
I hope there are deer there now and if there would I would think they would bed in the area I circled in yellow.
How about just a general question. In general how large of an undisturbed area would you need to set aside for a safe haven?