How do you find members to join an alliance?
You can use the leaderboards to find members who are not part of an Alliance, or just look at your world map when you find opponents without Alliance.
(The leaderboard currently has scrolling issues though, but it will be fixed as soon as possible.)
You can also post here: http://forums.flaregames.com/forum/88-looking-for-alliance-members/
How do you get to the leaderboard for players? I can get to the alliance leaderboard through Alliance Hall but Players leaderboard are not there.
Just tap on the Trophy UI on the island map or town scene.