Hi,
I have done many JavaFX projects in my 4 years of experience. I can see here, you need to call the appropriate methods to get the game working. I can help you with this in 1 day. Please feel free to initiate a chat if required.
P.S: You can have a look at one of my JavaFx project(here: [login to view URL]) if you doubt my competency.
Cheers!
Akash