Well there are many ways of setting up a minecraft server. Some people use the basic method to just use the Minecraft Server Application found on The website of Minecraft. But for an advanced server where you can use plugins you have to use CraftBukkit. To find it go on Bukkit.Org. For the IP for others to connect is a bit complicated. The easiest way which even i use is to download Hamachi. When you install it. Hamachi will give u a generated ip. Put that Ip in to ur Minecraft Server.properties. The IP there. Then you and your server friends have to use that IP to connect. And Hamachi has to be on for it to connect.
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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.
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