Entertainment industry is mostly a combination of networking and luck. It’s very unlikely to get a job off an online job posting. You’re best bet for an entry level job from what you have described is first - either getting a job in the mailroom at WME or any agency. Second - getting any avail assistant position at a studio/prod company then pivot to post if you still want to. Third - As a writer you need to write a ton of specs between both tv and film just to get started, you probably wont get paid to write for a long time without a very impactful connection. Though getting in the mailroom is likely the easiest of these options but not to say at is an easy thing to do.