Welcome to permies Woody.
There is an established Willow Oak on the South East corner that gets a full sun exposure across a Monsanto special corn field and has a a relatively clear under story.
That is one place that you may want to be 'overgrown', as a thick bush level will screen any spraying your unenlightened neighbor may do on his field. Overgrown hedges are actually a nice way to start - better than barren fields. Instant livestock (and predator) fencing, and natural habitat for a multitude of beneficial species (as well as some others - as long as it remains in balance, it's fine).
In the last half of the 20th Century, most hedgerows were destroyed as farmers followed the USDA advice to "Get bigger, or get out!" As the farmers were ripping out the hedgerows, they discovered that the soils under them were the richest, and healthiest soils on the farm. Soils that developed as Mother Nature had intended (and without the destructive chemical inputs).
I envy you having an old shed to plunder. Who knows what treasures may lie in there.
I read of a couple who bought an old farm from heirs who wanted nothing to do with it. A caveat in the sales was "...an old barn full of junk." They paid $40,000 for the farm, and slowly began cleaning out the barn. Their first year there, they had found many items the needed, and sold $20,000 of equipment/items found in there. And, they had only gotten about half way into it...they were just getting to the antique items and bigger stuff.
You can hack away at the hedge to keep it manageable, but most of it will continue growing back - a sure sign of a healthy system.
Good luck with all of your projects.