If you're new to Mastodon and need help navigating it/figuring things out, please feel free to ask me. I've only been on here for close to 3 months, but I've learned a lot in that time and will help however I can.
The toot just now by @Gargron is great advice: set up your picture, post a bit, get your bearings, then start following people.
You'll make new friends in no time, as long as you're friendly and welcoming to others!