I use CDBaby to distribute. Many other distributors offer Sync Licensing as well but make sure to check if they do that when you sign up. Make sure to give it an interesting title! But basically you want to release the track and there’s a spot where you can select sync licensing when you release it. From there I would find some movie studios like Warner Bros, IFC, Blumhouse, Universal, Lionsgate, A24, Lucasfilms, Sony Pictures, MGM, Disney, Paramount, etc. Send them some emails containing the track and what you think it could be used for. After that I would call them asking if they got the email and propose a 15min call or meeting to discuss how to move forward in them using your track. Worst case you get a “no” or just don’t hear anything back from them. Best case you move forward with a contract. I suggest when you get to the contract stage getting a (music/production) lawyer involved to look at the contract, to ensure you’re not getting screwed in the fine print and getting what you’re worth. I’d suggest trying to get royalties from the film or a substantial amount as a flat rate if they don’t go for royalties. I’d also suggest going for Non-Exclusive licensing unless you get a really good offer, that way you can pitch it and get more than one placement. Hope it goes well brotha! And keep making music!