Add essentials to your Minecraft Server

Basic File System Setup.

Make sure your Java version is Java 8 or newer.
Open a terminal session:
Change Directory to Desktop

 cd home/pi/Desktop  or cd Desktop    

Make a new directory (Folder) called minecraft_server

 mkdir minecraft_server 
 Change to the directory
 cd minecraft_server   

Use the touch command to create a shell script file in that directory name start.sh

 touch start.sh

Enable the Read/Write attributes with chmod command to the start.sh file

 chmod +x start.sh

Modify the start.sh by adding the following 2 lines using nano.

 sudo nano start.sh