Social media is a powerful way to build hype surrounding your project and it can often lead to opportunities—don't wait to start your social media accounts! Even if you don't have all the details hashed out about your project, you can just post about project progress.
My recommendation is to use Facebook and Instagram (and maybe TikTok if you have time for it)
These are some social media tips from my own experience. There's lots of other tips online so I recommend doing a quick google search if you're not familiar with social media marketing!