Learn How to Play American Croquet
The best way to learn how to play American Croquet is to play Golf Croquet with someone. This will teach you how to swing a mallet, hit a ball, run a hoop, and the order in which the hoops must be run in Six-Wicket Croquet. Then have someone teach you how to play American Croquet. This will teach you two-ball shots, running breaks, sequence, and carry-over deadness.
But if you want to do some learning on your own, visit some coaching websites, and read some of these articles.
You can buy a book or video about American Croquet.
Don't spend too much time reading — get out there and play!