You can expect to receive 1-3 bushels of apples per tree and could be ripe as early as late summer through autumn depending on the climate of your area. There are many varieties of apple trees that will resist scab, look for Dayton, Freedom and Enterprise apples, Goldrush, Janafree, Liberty, Redfree, Williams Pride or ask your local nursery for a list of other varieties. Dwarf varieties are much smaller and self-fertile so one tree is enough to plant. Sweet Cherry varieties generally yield about 30 quarts of fruit and are ripe in early Summer for most growing zones. Sweet Cherries need cross-pollinating while Sour Cherries and Dwarf Sweet Cherries do not.
Most peach trees are self-pollinating.
You will need to mulch and fertilize your tree and it can produce about 3-5 bushels of fruit in mid to late Summer. If you want to have several peach trees, I would suggest growing a variety of peaches so that they will ripen through different weeks. This will allow you time to preserve the fruit or enjoy sharing the peaches all Summer long. However, if you have a neighbor with a compatible Pear tree they could pollinate each other up to several miles away. Pears will yield 3-4 bushels of fruit per tree and be ripe late Summer through Autumn.