The first step is to create your own personal Keystore that will contain the information used to digitally sign your Android package files. You can do this with the following command:
"C:Program Files (x86)Javajre1.8.0_45binkeytool.exe" -genkey -v -keystore youFileName.keystore" -alias your_alias_for_keystore -keyalg RSA -keysize 2048 -validity 30000
The 30000 at the end of the command denotes the length of validity of certificates; Google requires this to be higher than 2033.
Before you run this command, make note of a few parameters first. When you run the command, it will ask you to enter the following parameters. These parameters will be used again later in the project file:
Password - <yourpassword> Name - ...