There are no co-leaders in factions because there can only be ONE admin in a faction, but you can make others mods by pressing /f mod usernamehere. Mods (or moderators) can kick other players that aren't mods, change titles of others, claim land, unclaim land, etc.. They have a lot of functions, but not as many as the Admin.
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Check the Minecraft Wiki. It has information there.
No. You can suggest it on the Minecraft Forums and someone might make a mod of it.
It depends on if the server you are playing on even has factions. If so, type /f create (factionnamehere) to make one or /f join (factionnamehere) to join
No but they can make you an op. Would you like to join my server? If you do visit these websites minecraft-cliffside-server.webs.com, cliffside-forums.webs.com
To get power for your faction, first of all, you need players in it. But, these players might have a low power level because they keep dying (you can check this by typing /f power usernamehere). In order to get more power, your faction members must not die for a while. The more one dies, the less power they have, the less power the faction has.