Welcome to IndieTalk! Glad to have you here.
Kudos to you for finishing a screenplay because that groundwork is exceedingly tough and difficult.
This forum has some very insightful and experienced writers who would be more than happy to peruse your screenplay if you'd like some constructive criticism. I can't stress enough how important the story and dynamic characters are to the finished product; your short film. Great films come from great writing and great writing comes from re-writing, then re-writing, then more re-writing. You should take your time and ensure the writing is good.
I know you must feel an incredible enthusiasm for your film in wanting to begin the production process. Patience my friend.
How much pre-production work have you done? There is a lot you can do on your own before beginning the actual filming such as storyboard, shooting schedules, character outlines, location scouting, shot lists, budget, and a plethora of resources to accumulate (props, permits, jigs, vehicle, etc.)
Best wishes to you Gomez.