We are happy that you are now a part of Upwork! I've pulled a few resources to help you get started. Check out these articles to help you create a profile that stands out and improve your profile title and overview. For some great tips on writing proposals that win jobs, check out this article.
I will add to what Nikola share with you; learn how to stay safe while on the platform.
This is a good read for anyone, not just new comers.