I as the operator would like to send a "server message", so all the players can read it, instead of me sending the message specifically to each and every.
The general gist of running a Minecraft server is that you will need to install java, run the server, accept the EULA, and run it again. Once you have.
Go to your game menu and press "Open to LAN". Next, it will show your IP address. Write down the IP address, and go back to the title screen and click on.