I wouldnt do multiple years. Put them in a pot in the spring, plant them in the laste summer or fall. IF buying grafted trees, try to ask for the runt of the litter. Or, plant the bigger ones now, and plant others later.
Sooner in the permanent home, the better.
Did 10 rootstocks last year. Grafted them in the spring, let them go throught the majority of the summer, and then plant them soon afterwards.