Launch apps full screen
You can use automator to create an application that will launch the application that you want to open in full screen and run an apple script. The script can perform a keystroke to run the shortcut for full screen.

Launch Automator, Choose Application, Drag "Launch Application" from library and choose desired app, Drag "Apple Script" from library, enter apple script (check with specific app for correct keystroke), this works for chrome

here is the script for google chrome fullscreen app:

on run {input, parameters}
    tell application "Google Chrome" to activate
    delay 2

tell application "System Events"
    keystroke "f" using {command down, control down}
end tell


Screenshot

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Link with tutorial to create Automator Full screen application
https://youtu.be/5L5ikafzCzI