Greetings and Welcome to the Fediverse.
Your first mission, should you choose to accept it, is to start finding people to follow.
You really don't have to be super picky right now. You just want to start getting your feed busy so you can start organically finding content.
Additionally, if you've decided to use the Tweetdeck-style advanced interface, make sure to set up one or more columns with hashtags you want to follow! That's another big way people discover content on here!
Mastodon doesn't default to having an in-your-face content algorithm, which does mean that you need to put in a _little_ more work to find stuff you want to engage with. This is a good thing!
Your second mission, of course, is to actually _engage_ with stuff you like, instead of just liking and walking away. Having conversations with "randos" is a lot easier and less awkward on here, and people are more likely to respond to you. Talk to us! Even (especially) if we have a lot of followers! This is how you get the other end of the puzzle (people who follow _you_).
Enjoy your stay and I hope it's safe and cozy <3
