You still have to begin a short story in a manner that has the ending written into it, even if you don't have a clue how the story will end.
A great statement, which I endorse.
Tony1, if ideas were a dime a dozen, I'd have been rich a long time ago.
Get the flash. Jump into it, pin the squirmy li'l sucker down in words, then send it out & get paid.
Oh, so simple that it is, would that it were so easy! I spoke to an author who's sold almost 2,000 pieces (& resold some of them thirty or forty times). He said his files have ten times that in unfinished pieces. "Every month or so, I find myself thinking about some half-baked idea from 1967 or 1985 or whatever, & suddenly I just know exactly how it works out. I pull it up, finish it, & more often than not have a good idea as to who'll buy it instantly."
He wrote an article many years ago where he recommended writing down difficult ideas as fully as possible, kicking them thoroughly in hopes they'd behave, & filing them as soon as you determine it's unlikely. That way, you clear out your head & move along to faster rewards rather than waste time & effort on something that might take years to gel.
There's something to be said for trying to take every story idea to the mat two-out-of-three, but often it just won't work out. Treat it like a "cold case": map out all the data, write down every snippet you can think of, then write something else. Good ideas are surprisingly difficult to lose.