League play is a different animal in my Canadian city. I play in three leagues and none of them are on bar tables. All three venues are on 9 foot tables.
I also play Snooker on a 12 foot table. The technical skill set, geometry isn’t any different from a coin operated bar table.
When it comes to pool, I find play easiest on an 9 foot table. Much easier, for me, than a smaller bar table. On the larger table I am more master of my own fate and less subject to the clutter of how the balls may break.
An aside, you have to play to get good. You won’t be hitting enough balls in league to develop your skills. Visit a pool hall, Legion, or whatever you have in the US and just have fun banging balls around for an hour on a larger table. Forget about practice or rules....just shoot balls. Get a feel for things. Then, if you enjoy it, try a bit more structured learning in your own. The better you get, the more you want to practice and it becomes a self-fulfilling cycle.