If you have a normal server, you have to op people from the console to give them permissions. If you have a craftbukkit server, you can download a plugin for permissions.
Use the hamachi server.
Watch youtube videos.
you cannot set up permissions in a normal minecraft server. you must have a bukkit server to use permissions. check the bukkit forum for more info.
You need the server software first. Once you get the server set up, you can copy your save to the server.
No
Anyone who downloads the server application. Even you can set one up on your computer. Go to minecraftforums.net for one, scroll down to the servers area, or just Yahoo/Google minecraft server.
You should be able to. Contact your friend and see whether or not he or she set up the server right.
Minecraft has a separate multiplayer server file to download for free. Just look for the links for the forums or look at Youtube to find out how to set it up.
You do not need a Minecraft account to set up a server, so unlimited. However most computers can only run one server at a time
In order to play Minecraft with friends, you need to set up a server. You can either set one up on your own computer, or you can rent one from a company for fairly cheap prices.
If you are the host of the Server, you open up Minecraft Server . Wait for it to load then it will say its ready. If you are going to someone else's server, and it has no bars, then there server is not active. (Which means they dont have Minecraft Server up).
Minecraft Wiki has a complete guide. The link can be found under 'Sources and related links' below this answer.