It would be hard to offer a complete survey of short stories in the small space I have available. The best short stories were written in America, England, France, and Russia. If you only want stories originally written in English, that would exclude great stories written by Maupassant in French and Chekhov in Russian. I suggest that you ask eNotes a number of separate questions, such as "Can you recommend famous and interesting short stories of about 2500 words by American authors?" Then same question about English authors. Then about French, if you want to include stories in translation.
For American authors, you certainly should include Hawthorne, Poe, Hemingway, John Cheever, O. Henry, and I could name many more. Since you have access to the Internet, you could query eNotes about these and other authors. E-Notes has plenty of reference material on short stories.
The best book about short stories that I know of is Understanding Fiction by Cleanth Brooks and Robert Penn Warren. This is full of good short stories and analyses of them. I don't know if you can obtain a copy of this book in Iran. It is often used as a textbook in college courses.
Again, I would suggest that you submit separate questions to eNotes about authors of different nationalities. You can also Google questions such as Best Short Stories?
ENotes contains a wealth of information about Hemingway's "Hills Like White Elephants" and Poe's "The Cask of Amontillado," two stories that are short and should be included in your anthology.