Hired for a short term contract job, and was paid a fixed rate of $2800. It was my only income this year. What is the process of filing my taxes with this in mind?

I was hired for this project, and it was meant as a one time gig. I am currently unemployed, so I don't have any other income as of this moment. However, since this was a pretty big sum of money, I was wondering how I should file this? I am just confused on if I need to file it as a self-employed, or something else, since I don't do this type of work very often. It'd be helpful to know for the future as well.