Depending upon rootstock and varieties grafted, dwarf apple trees usually grow to between 10-15' tall, but can be pruned and maintained at 8-12' tall.

Dwarf pears usually grow between 12-18' tall, but can be pruned and maintained at around 10'.

Growth habit of apples and pears largely depends upon variety of rootstock (dwarf is a size, not variety) and grafted varieties. Full height should take around 10-15 years

Dwarf apples and pears usually start bearing fruit around 4-5 years old.

If all of the apple and pear varieties are annuals and bear every year (as opposed to biennials which bear every other year), you should be able to get about 1-2 bushels of fruit per tree.

-Nick