Welcome to steemit.
There are a lot of things you can do. You can update your profile by adding your display name.
Adding Profile picture and the likes.
You can follow trends and learn more. Follow people, upvote and resteem posts.
Enjoy yourself and post valuable content, all these stuffs fetches you rewards that you dont get on other social networks.
Read FAQ for more info.
https://steemit.com/faq.html