A pile of story ideas I didn't sort out yet

For a while now, I really wanted to make a professional comic. I just don't know where to start. So right now, I just want to make a WattPad that's similar to the story I had in mind, so that I'll have a more clear idea of all the plotpoints. And if you were wondering, the cover is a drawing of one of the main characters, Senjo(Sen for short).