Don't wait too long to plant your tree. Now is the ideal time for planting.
Where to plant your tree? Imagine your baby oak growing into a large tree so make sure there is space available for it to spread. Don't plant it too close to a building. You can even plant a group of oaks as close as 8' apart which mimics the way they grow in forests.
Dig a hole that is just the depth of the container and only 1.5 to 2 times the diameter of the pot. Take care not to plant too deeply. You want the collar at the base of the trunk to be level with the surrounding soil. Backfill the hole with the original soil without mounding it up.
There is no need to fertilize. These oaks love our soil.
If possible, add a circle of wood chip mulch a few inches deep around the tree. Keep mulch away from the trunk. If mulch touches the bark, it can cause rot so keep a 3" zone around the trunk free of mulch.
Water the tree liberally for the first two days after planting and continue to water it for the first two years after planting when rain is scarce. A deep soaking once a week is ideal.
If your property is visited by deer, you may want to surround the tree with a simple chicken wire cage to keep the deer from nibbling on it or rubbing against the bark.