Ever heard of young writers society?
It's an awesome site to post your work, get it editted, talk to other writers, get ideas and stuff. I'm over there too.
As for story ideas, I get my best stuff from real life. Either building on a situtation thats happened, changing the ending of something thats happened, or turning an event a different way.
I'm in the middle of a story and starting a new one soon so if you need any help PM me or check out yws. It's pretty chill.