I just found this website today. I did a search and did not find this practice game listed. Please let me know if anyone knows of other practice games or links to other good billiards sites.
You rack ten balls and score the game like bowling. If you run all ten balls it is a strike. If you miss once it would be a spare. At first you may want to allocate yourself n amount of mulligans. You can decrease the mulligans as you get better. You are really an expert when you modify the game to require yourself to make the balls in order (1-10).