Started my food forest! Planted 9 fruit trees, 7b beside a creek

I just started my food forest adventure! I was given permission to build a food forest in an overgrown field that used to have horses. The soil is a mix of old manure, clay and some gravel it appears.

Planted 3 cherry, 3 apple, 2 peach and 1 pear, still waiting on 2 pears to arrive and will buy a couple more fruit tree plants to fill the holes and I will put edible shrubs or plants between the trees.

Planted the 9 trees with no problem. I did 10 feet spacing between them and left a bit more for standard size apple at the end.

My biggest concern is not enough light and pests, mainly deer and bugs. What are the first steps I need to do to protect them? I was told I could put up an electric fence around field if needed.