I have two barrels I got from my local Saturn dealer. They had car
washing solution in them, are of the 55 gallon size and are opaque
white plastic.

I want to use at least one for a compost barrel after a thorough
rinsing,. I have the hardware to install a hinged lid and will roll it
around every few days to mix the contents.

The one thing I am not clear on is where and how many holes to drill.
The advice I have read says to drill holes but I have not seen the
deatails. Specifically:

(1) Where? Top and bottom? The sides or both?

(2) What size holes?

(3) How many?

Any feeedback will help me get this up and running this weekend.