There isn't much anyone can do to ensure winning awards, but there is one thing one MUST do to be able to give oneself the chance, and that is to produce work eligible for the awards.
I suggest you start by finding out what is eligible work to win the prize you wish to win
Find out previous winners and study their work.
Read the production and write something, every day, in their style. I suggest you choose to focus on one writer every month, and read every day a portion of their work, and write something in their style. In the beginning it can be straight copying what they have written, but be sure to mark it clearly that you - or someone else in the future - will mistake that for your own creation. Copying is a great way of learning. It's not a good way of producing original work, but it's a great way of learning to produce original work.
If it is a screen script, try to find the original script and read it.
Watch movies based on these scripts. Study the art of script writing by comparing a script to the filmatization.
Read books about how to write a script, to learn the craft.
Practice by writing a script by a movie and comparing that to the original script.
I would say
winning a fan fiction award is the easiest, as there are dozens of
those, and the pool is smallest and also the requirements easiest.
you need to find the award you wish to win, and start producing fan
fiction. Loads of it. Preferably on several fan fiction sites. Get
yourself name writing fan fiction.
Also, remember one
thing. Both E.L.James and Cassandra Clare both got their "fan fiction"
published. Erica Mitchell (E.L.James) also broke a world record with her
book and became a millionaire, which would be very nice for you, if you
could repeat the deed... ;-)