Have it read by some reputable people who do coverage; you'll pay for the service but their feedback will let you know if the script is actually ready. 2. Write a 2nd script. If you send the first out to, let's say, a manager, and he or she likes it, their next question to you is: "What else you got?". They want to know if you're serious about your screenwriting career, and one of the ways to tell that is to see your body of work. Of course, if your first script knocks the ever-loving crap out of them, that'll pretty well nullify point 2.
If you have a second, check out: https://www.stage32.com/lounge/screenwriting/Screenwriting-Contests-that...
Chris - Above all, keep writing. "One screenplay doth not a screenwriter make."
Got to Good in a Room dot com and read everything there. Seriously. It's educational.