First, a bit off track, but here’s a gui to help create launchers for script or other applications
http://www.florian-diesch.de/software/arronax/
otherwise here are some starting points
http://askubuntu.com/questions/64222/how-can-i-create-launchers-on-my-desktop
http://askubuntu.com/questions/141229/how-to-add-a-shell-script-to-launcher-as-shortcut
https://community.linuxmint.com/tutorial/view/162
https://community.linuxmint.com/tutorial/view/1998