An apple hedge is ridiculously simple. 1. Stake it out 2. Plant it 3. Wait a few years 4. Pick, eat, store through the winter.
The system here in this photo is mostly neglect. First plant a nursery of dwarf rootstock 3’x10″ apart -count on loosing 10% to voles (large underground field mice), dig out damaged trees and replant 3′ apart down a row-in this instance 20 Crimson Topaz. After they get 3-4′ high tie them over to the base of the next tree or to the base of the second tree over if too tall, now they sprout at the high point and you repeat the tie procedure -let grow up 4’+then tie over. The trees in the photo are 6 years old, 2-3 feet high, bore about 75# last year are growing on bud -9 dwarf rootstock.