yes just put the world file that you want into the world folder in the server files
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You need the server software first. Once you get the server set up, you can copy your save to the server.
In your saves for Minecraft, copy the world that you want to make into a server world. Be sure to copy the entire folder. Open your server folder and paste it there. In the server properties file, change the name of the server to the name of your world's folder. Then launch the server and it should be your exact world.
Sorry it's probaly not possible ):
he doesn't have a server, he plays minecraft on a local, single-player world.
To make a LAN server, there should be a button in the menu. The join, you go the the multiplayer button in the main menu. If there are any that you can join, it will tell you.