I have been a gamer forever and I want to transition from game player to game maker. I’m excited to start learning with this tool. I think it will be a fun self-taught experience.
welcome aboard 
feel free to ask any questions, but before, please see:
https://wiki.jmonkeyengine.org/jme3.html#tutorials-for-beginners
https://wiki.jmonkeyengine.org/jme3.html#documentation-for-intermediate-users
https://wiki.jmonkeyengine.org/jme3.html#documentation-for-advanced-users
also you have nice JMETests project you can open in IDE.
it contains JMETests that show some functionalities and you have code to copy-paste from there.
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I remember when I started using JME in 2015, I was in the same situation as you, and wanted to create games like the ones I had been playing.
For some getting started advice:
The wiki is your best friend, and imo looking at the source code of working games will help you learn quickly. Check this out: Any open-source games made with JME?
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