Learn the formatting. At first it may seem stupid and strict, but it's ridiculously important and useful. Look up what to capitalize and why. Look up how to introduce new sounds and people. The screenwriting world is slang ridden, so that'll be useful to pick up. This website is hard to look at, but it's pretty useful.
https://www.screenwriting.info/
Everything is in present tense, as if you're watching it unfold right now. This, in my opinion, makes writing easier since you can divy our most things to your audience in real time while still keeping a main character's prospective. You may need a grammar refresher, though, or reading through your script may sound funny.
The lines between show and tell will blur. As writers, we strive to show and not tell. That makes for a boring story. We want to show our audience what our characters are feeling, what's going on in their lives, not just say "he was sad". However, when you're screenwriting, you have two audiences- the production crew, and the theater goers. When a visual aspect is added to the world of story, you have to tell what you're showing you aren't telling. It's a balancing act- on one hand you want the script read through to be as entertaining as possible, and on the other you don't want to spoil everything in the first 20 pages.
Write spec, not commission. Your first drafts should be "speculative" screenplays. These are screenplays without (at least most of the) camera angles and technical stuff- lighting, sound effects, etc. Start out bare boned- all you really need is…
Action + dialogue ÷ sluglines
Action, being what's happening on screen. Dialogue, being not only what the characters say but in the manner they say it. Sluglines being the scene headers- you don't need to work out cut tos or transitions yet, just focus on separating your story into scenes.
READ SAMPLE SCREENPLAYS
I can't stress that enough. Look at how other people write. Pick up their movement. You can even find some screenplays of your favorite TV shows or movies I'm sure. That'll also give you insight to how things in the script change in production (and think about why).
Besides that, I'm sure you can keep in mind cinematic story arc and drama, story beats for movies and TV, all that jazz. Once you're comfortable with your first drafts, you can add fancy camera stuff and effects.
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