I am from Maine and was supriesd and happy to see your post.
1. You have No Good Gophers already, so go by which game is best to play and earner rather than golf themes. Teed Off is not a good game. Crane machines do really well I heard, but you need enough kids to come through though.

2. Rotate games out that don't earn. South Park is a good one and legend has it that it is a home run on location. Newer TWD and ST do well, so I hear. I hear games like Demolition Man do well also.

3. On a league I would try to reach out to some local pin players and say you will support the players if they come and play there. Have them do the rules and scoring, not you.

Maybe contact a guy named John Reuter out of Gorham. I never met him, but heard he is a staple of pinball in Maine. He has tons of games also and may want to route them. Tell him what you are looking to do and maybe he can help. Disclosure - not sure of this info though, but people in Maine are pretty nice and helpful usually.