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Use the hamachi server.
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.
Servers are free to get and set up. Simply download it from Minecraft's home page. The link can be found under "Sources and related links".However, you will need to purchase a premium account to sign in to your server, unless you set the flag "online-mode" in your server.properties to false.
First off, an online server means that the server is up and running. It is available for people to join. An offline server means that the server is down and closed for people who want to join.