Step 2: The Barrel
Clean it well. You never know what was in it. Choose a food-grade container to avoid potentially dangerous chemicals.
Lay the barrel down like a canoe, so that it would catch water. This is the position it will be in from now on.
On one end of the barrel (which used to be the top when it was whole) there is a rim of plastic that protrudes. Cut this away.
Rub the interior with beeswax. This will remove any foreign smell that remains and make it more attractive to a hive. A drop or two of lemongrass oil is good as well.