This is the first scene of your story and should compel your audience to read on. If you’re stuck, start by introducing your protagonist in their natural setting.
Think about what questions your inciting event will raise for the reader.
In a short story, you don’t have a lot of space to build up to the climax. Be deliberate with the rising action and make sure it is relevant to the themes you’ve proposed. Everything that happens should progress the story in the right direction.
The antagonist does not need to be a person, necessarily: the protagonist could be struggling against internal or external forces or circumstances.
Especially with short fiction, it is not necessary to tie up every loose end your story has created. Just be sure that you return to the original question your story posed.