Skerby,
Welcome to the fun! I have been on my place for 18yr, and been trying to figure out how to landscape it ever since.
I have read a lot of books, and mags, but they don't deal with an area like ours. They are mostly for 1/4ac town lots. I just try to take the ideas that I like from the books, and try to fit them to my scale. Some work, some don't! Don't be afraid to rip it out and start again. Sometimes it takes a couple a years to realize that that plant you thought would look great there just AIN'T GOING TO WORK!

Take it out while you can and move on!
You didn't say what kind of equipment you have, but this will make as much difference in what, and how you plant as anything else does. Do you want a LARGE yard? How well do you like to mow, and how big is your mower? Do you want to spend all your free time in the beds weeding? And where will you get the mulch for all those huge beds?
One thing I will say is to lay out your beds, and lawn's using what ever you use to mow with. Just drive the outline of the beds you are considering, and see if you have to make back ups or to tight turns to get around obstacles or can you cut it on the fly. Each one of these restarts cuts up the yard takes up precious time. If your mowing with a 6' finish mower and tc40, you don't want to plant your trees any less than 7' apart. Unless you want to hand trim around them.
One thing that I can say is that when you garden on acreage, it is almost like having your own private park.

You should remember to plan for what it will look like when you are gone. Think about what you want to leave to the next caretaker of your property, cause you won't be the last one to fall in love with the place!
Oh and one other thing... Hope your pockets are deep, cause all this equipment to care for your private garden don't come cheap.
