Hello and welcome! I really like the prompts from stayintheroom. If you are also on LJ still, the prompt posts at Musemuggers are public, and typically have a link to writing contests and submission calls.

If you like writing romance, Elm Books has a submission call for stories for their Christmas/Solstice anthology. Unfortunately, they are looking for het romance for that one. I have a story in their mystery anthology that is coming out in a month; they are good folk!