The very first thing I would do is go to Lowes and buy a few hundred, "Posted, No Trespassing" signs and some plywood backing for them, which I would cut to fit the size of the signs. If money were no object, I would high fence the entire perimeter.
The second thing would be to check out some aerial photos from GoogleEarth or Yahoo maps to see what things look like from the air. Topographical map would be next to see where the probable funnels are.
My biggest concern for my property is keeping others off of it. I don't like the idea of anyone getting over on me when I'm the one putting in the food plots, making the land payment and paying the taxes. Unfortunately, my line of thinking will cause a decline in hunting in the forthcoming years. But as long as I get mine...