First you install bukket, then drag the plugin into the Plugin Folder
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You do not need to own Minecraft to host servers for it.
Minecraft does not charge you to run a server for the game. You will, however, have to posses a computer to be the server. Otherwise you will have to rent a server to run for you, which costs money.
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
It does not cost anything to get a minecraft server. You simply download the Minecraft_server.exe from the minecraft website download page. Then, you run it to make your own server.
You need to have java 6 or later installed on your mac for a minecraft server jar to open correctly. If this doesn't work you can use a terminal command to run the jar.