Dig hole 1.5 times the diameter of the root system, but only as deep as the root system. Do not plant too deeply, meaning the top of the root crown should be above the soil line. Amend planting soil with 3 parts soil conditioner to 1 part mushroom compost. Follow individual plant instructions for sun or shade.
To keep trees straight, it helps to use a bamboo stake for the first 1-3 years, tied snugly with a flexible connector like panty hose or rubber bands.
Mulch well with 3"-5" of mulch in a diameter that covers the drip line of the plant. Water thoroughly and remember to water 1x per week if there is no significant rainfall for the first growing season.