I don't think you can. All you have to do is not die and play for a long time on the server that you want to get the faction power on.
I assume you're talking about a faction invite. the command is /f join <faction>
It must have the factions plugin. The command it /f create name
The command varies from server plugin to server plugin cause some people make they're one plugins
It depends on the Minecraft server and what plugin the server is using for factions, sometimes typing "/help" on a server will give you the command syntax (what is required for each command). Alternatively if you know what mod they use, Google search for the plugin/mod and find out.
To answer a faction invite just do /f join <faction name>
You use /f leave [faction name]
If you are in a faction, and want to teleport to your faction home, just type /f home.
add them to your faction with /f join <faction name>
You can create a door by doing the following: ("Plank of wood" is "pow") in the 3x3 crafting square: pow;pow;nothing pow;pow;nothing pow;pow;nothing then you right-click on the ground where you want the door to be. Right-click the door to open/close it you should use minecraft wiki, it would answer all your questions
Press T
You will need to the faction plugin for bukkit once running then do in the chat /f create {name of faction here}
You kill mobs and players