I need some ideas?

This question is a red flag to some people. Your writing in a genre that requires the most imagination and creativity and you can't even figure out a basic, real world situation. How do you intend to do the Fantasy stuff when you can't even figure out how couples get together in fiction? Sorry to be blunt but I think you're going to seriously struggle. 

Dark ages as in Europe after the fall of the [Western] Roman Empire?  After an apocalyptic event?

If your world is like the lives of the Celts, Visigoths, Vandals Vikings etc (like GRR Martin's saga), you can read a few history books about their cultures for inspiration.

Writing a book or novel, are we? It's always a good sign when an aspiring fantasy author lacks the creativity and imagination required to execute a plot. Good luck with everything. If it's "123 easy", whatever that's supposed to mean, and you still can't figure it out, perhaps you're not ready to write anything yet. Consider that then. 

There are so many of these tired stories you should be able to follow the same template. Some original stories would be welcomed instead of continually regurgitating the fantasy superpower trash.