Growing up in Halesowen, United Kingdom, I've been writing throughout that time in some form. Holiday diary entries laid the way for blog posts, and short stories of fan-created content grew into full original ideas.
The most interesting part of a story for me is the character interactions, whether they be friendly with each other or shouting down each others' necks because of a mistake one of them made. That also goes with world building and how these characters interact with the environment around them.
With my ideas, I build up the characters and world, and place them in situations to see how they would react. My first published novel is exactly that, with future stories building off that with more focus on plot.