If you have good soil, you can dig your holes and then mix the dirt with compost and a fertilizer that promotes root growth. I use E.B. Stone Sure Start and Planting Compost.
With outdoor growing, don't get too technical, unlike indoor growing. Keep in mind that cannabis is a weed, which means it is pretty strong. Harden your clones by gradually exposing them to the elements.
My personal philosophy is not to coddle the plants too much. Outdoor plants will be exposed to harsher conditions. Some clones may die, but others will be giant monsters.
The real challenges come in the fall when you harvest, because that's when all the critters want to suck the juice out of your flowers.