As with most fruits, blueberries bruise easily, so handle them gently.
As soon as possible, gently pour berries onto trays or on paper towels on counter tops one (1) layer of berries deep.
Let the berries sit until they are dry.
Sort the blueberries, removing any stems, little twigs, etc.
To use fresh: As soon as possible after berries are dry, put in covered bowls and refrigerate.
To freeze: As soon as possible after berries are dry, put on trays one layer deep and freeze. It only takes a couple of hours. Dump the frozen blueberries into freezer bags, label, and return to freezer.