Send like you would any story, with breaks for paragraphs and lines, but no page numbers. That said, the text can have lots of paragraphs from one line to several (with a new thought, or a different character speaking), or can have breaks every line when formatting a poem (if the story is in verse, whether rhyming or not). I tend to have lots of line/paragraph breaks, especially when I'm drafting. (I also add page numbers in pencil on the margins when I'm working on a dummy, but those numbers are just for me and don't get subbed.) Some of my line breaks get put together in longer paragraphs before submitting, some don't. Depends on the story and what it needs. Good luck with your story and submissions!