That's a worthy project. Lots of good ideas already posted.

Blast makes an interesting point: the pond is already a cleared area, giving increased sunlight to the northern side. I'd go out regularly and mark the limits of sunlight early in the season.
Of course, the topography may not be suitable (if, say, it's a low area).

You could create a micro-climate for tomatoes, squash and peppers with a 6-10' solid panel wood fence near the back of your garden. "Indeterminate" tomato varieties will climb all the way up. Pick the spot with maximum hours of direct sunlight. This is a good spot for composting too.

Another consideration: are there any "night raiders" about (deer, rabbits/hares)? They will clean you out unless you fence the perimeter; dig the fence well into the ground.

I like the idea of trimming/topping "junk" trees to increase your light exposure.

Hope the project comes together well.

BTW: I'm told that Troy-Bilt is not what it was. The company went under, the name was bought out, and the new product is not nearly as robust as it was in years past. So consider a careful investigation before buying.