All the short stories I teach are public domain, and (usually) easy to find online. That said, I publish them as we read them in Canvas in a module called, "all short stories and essays." Feel free to download them as you please. I do not make them all available at once (there are about 60-70 I use, on a rotating basis) because it looks really frightening that way, but I'll publish them just ahead of any due dates on them!
External Resources
These are good for helping you with your writing, syntactically. There are lots of potential places to seek publication of your writing, but it's not productive to put them here.