Help compiling JavaFX project in IntelliJ

I am beginning to lose the will to live over this. I have several projects that use JavaFX. The compile and run through the IDE but I cant get a compiled jar file that will run.

I have spent days googling and trying solutions. I actually think that my lack of knowledge of Maven and JavaFX is stopping me understanding much of the advice given. Wawa Survey

Does anyone have any advice or solutions? Should I learn move about using Maven? Is Maven important? Useful? I know these are noob questions but eh it is learnprogramming!