Welcome friends! If you're new to mastodon in general I recommend you follow these accounts:
@feditips
@FediFollows
@FediVideos
Here's a short video explaining some of the ways that Mastodon is different from other social media you may be familiar with:
https://youtu.be/IPSbNdBmWKE
Here's a blog post I wrote talking about what alternative social media looks like:
https://threeraccoons.com/article/welcome-to-the-fediverse/
Some more tips for starting on Mastodon:
When making a new toot there's an option to put a "cw" (content warning). It's considered good practice on the fediverse to put commonly triggering or sensitive material (or even just spoilers!) under a cw so that people who might need to skip something for their own health can easily do that.