A common type and amount of bees to order is a 3 pound package with a mated queen. For a few bucks extra, you can have your queen marked. It is usually only $5 more, and a good idea to have your queen marked. Finding your queen will be so much easier when you do hive inspections. It also allows you to keep track if your queen has been replaced (superceded) by the hive. The superceeding queen will not have a mark.
Bees come in a box is equipped with a sugar water dispenser and a cage to keep the queen separate from the bees.