Inning limits are meaningless. The LL pitch count limits in the ASMI position paper that JH linked to are reasonable and workable.
I was in the middle of my two boys LL careers when pitch counts were put into place and a lot of managers kicked and screamed for a season or so, but then everybody figured out how to manage their staffs and it all worked out fine.
14-16yo - 95 max per day
17-18 105 max per day.
31-45 pitches = 1 day rest
46-60 pitches = 2 days rest
61-75 pitches = 3 days rest
76+ pitches = 4 days rest