This is my first story so I need help coming up with ideas please please review and send me your Ideas

I don't of the Percy Jackson Series or any of its characters

Percy POV

It's been exactly 1 year after we had defeated Kronos we just had had a big anniversary party to celebrate as I lay in bed I had a nightmare. I heard a voice very much like Kronos's saying "I will be back you've only been a minor setback to my plans to make Olympus fall I will avenge"