I recently finished a science fiction short story that I haven't told you all about because, for the first time, I'm submitting it to magazines and online periodicals to see if someone would like to buy it. If I'm successful you'll hear all about it. If no one has a place for it at this time, Perkunas Press will publish it. You can find out more about it here.
Either way, it will take several months. In general you can only submit to one venue at a time, so it can take many weeks or months before you reach a venue that wants it. Then they will not publish it right away, and when they do they will want exclusivity for it for a few months. If I am not successful with the submission, Perkunas Press will publish the story in the usual way and I'll announce it here, otherwise I'll let people know where they can buy it, and then Perkunas Press will publish it after the exclusivity period runs out.
I'll be doing more of this over time, especially for short stories that are either not part of a series or that can stand alone. It's a new experience for me. Short stories don't sell in great quantity, but if a magazine buys one, that changes the financial result dramatically. It's also just about the only way that an author-publisher can be part of the consideration for the genre and category awards that are such a major part of fantasy and science fiction. Finding out exactly what the magazine editors want will be a learning exercise all by itself.