Spring is the preferred planting time for many varieties of trees. Keep them well watered, do not flood them, do not let them dessicate. A wrap to keep rabbits and voles off is essential.
Pick one type of fruit and learn about it first, and then plant other types of fruit after you master the care of the first.
Although it is titled for Georgia, these are common diseases of apples from the Atlantic through the Great Lakes.
http://wiki.bugwood.org/Major_diseases_of_apple/Georgia
Plant disease resistant varieties, and consider your use. If you want to keep apples, make sure to check into their storage life! Many varieties don't store for more than a few weeks. I love my enterprise trees as they are very disease resistant and I have stored apples in my basement for up to 6 months.
Many apples do not self pollinate, and need another tree of a different variety. There are many excellent disease resistant apples, which I recommend for homestead types. I love Enterprise apples, and have a few along with Fuji's to give me a nice cross pollination. You can also find a variety of decorative crab apple that flowers at the same time and use that as a pollinator if you need a decorative planting out front, or if your neighbor wants to plant a few trees I always talk them into crab apples that flower when my trees do.
If you have limited space, use dwarf rootstock. If keeping them from being to large, bushy, and hard to care for is a concern, the espalier method is hard to beat. I keep short (9' tall) Belgian fence, and also just a trellised traditional 3 tier horizontal row of trees in my garden. You must have spur bearers, and not tip bearers. Tip bearers bear fruit at the ends of the branches, and these will be nipped off and limit production severely in an espalier type set up. The Fuji and Enterprise varieties I use are both spur bearers and produce a good amount of fruit from my funny little linear trees!
About espalier;
http://www.starkbros.com/growing-guide/article/espalier-fruit-trees
You can learn about different varieties here.
http://www.orangepippin.com/
You can buy grade #1 whips and get them mailed to you. No need to pick them up. You can buy small trees of superior grades and shape them yourself, or buy large trees that cost more to ship and are of lower grades for the same price. I buy #1 whips before I buy larger caliper lower grade trees.
Have fun. It's not that hard. It's not that easy. You can do it if you do a little work every few days and have a good plan. To me, espalier is the only way to do a yard, and then you can easily garden or graze between the trees with sheep, geese or boxes of rabbits, and you can limit pruning to hand shearers and no more than a 3 rung step ladder, or from the ground and limit the height of your trees to your reach.
I can also easily row cover my trees with floating cover and keep the bugs off or reduce frost damage. You need to study brown marmorated stink bugs. They are now the bane of Atlantic fruit producers.