Welcome to Upwork and Upwork Community. Thanks for reaching out to us. Please check out this thread and go through the guides, tutorials, courses, videos, Help articles and Community discussions, designed to help you start bidding successfully and winning jobs on Upwork. You may check Hiring Headquarters link in the thread I mentioned, and find there some excellent articles for both, improving profiles and writing good proposals. You may also read this article to help you avoid questionable jobs. Afterwards, if you have any questions feel free to follow up in the Community and we'll gladly help you with them.