I saw a couple threads asking how to make a minecraft server and rather than commenting on each one im just going to post it as a thread. This is only a guide to a non bukkit server.
First things first, you need to download the server jar from minecraft.net by clicking where it says "if you have already purchased it and would like to download click here". Im not sure if thats exactly what it says im just going off of my memory
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After downloading the server jar create a file on desktop and name it whatever you want, then move the recently downloaded server .jar file and move it to the file you have made on the desktop which I will now refer to as Server.
Run the .jar inside of Server and a gui will pop up saying it is generating map. Let it finish this process then close it.
Now you will need to edit the server properties (optional) Open it with notepad (right click and scroll over open with and click notepad)
Now you will have to either do the painful process of port forwarding, or download LogMeInHamachi. You can just look up a tutorial on how to port forward on youtube although I dont have time to type a tutorial for that to. What hamachi does is for people who have joined the network you can make on it is essentially port forward it for the people in your network. You do not have to port forward if you just want to play with people on your home network (people in your house).
First things first, you need to download the server jar from minecraft.net by clicking where it says "if you have already purchased it and would like to download click here". Im not sure if thats exactly what it says im just going off of my memory

After downloading the server jar create a file on desktop and name it whatever you want, then move the recently downloaded server .jar file and move it to the file you have made on the desktop which I will now refer to as Server.
Run the .jar inside of Server and a gui will pop up saying it is generating map. Let it finish this process then close it.
Now you will need to edit the server properties (optional) Open it with notepad (right click and scroll over open with and click notepad)
Now you will have to either do the painful process of port forwarding, or download LogMeInHamachi. You can just look up a tutorial on how to port forward on youtube although I dont have time to type a tutorial for that to. What hamachi does is for people who have joined the network you can make on it is essentially port forward it for the people in your network. You do not have to port forward if you just want to play with people on your home network (people in your house).