Welcome to the community!
If you already finished the tutorials on the wiki, I think it would be good if you start creating your own minigame, it is true that there is not so much information about JME3 in other places, but the community can help you on specific topics.
Don’t get complicated when creating your game, keep it simple and easy. I suggest you use the JME SDK to make things easier for you, but you can use your preferred IDE.
Really creating a minigame is very simple, you just need imagination (how you want your game), apply the knowledge acquired and if you master Java. The road will be easy for you, here are some demo games.
NOTE. JME is not a headache, it’s just different from other engines that give you everything by hand (graphical mode). I have nothing against it but JME3 gives you full control over your games, it’s great…