I want to file my W2's from a employer, but I also want to report a certain amount of money for self-employment. Would I have to file separately? If so, how is that done?

This year I want to file my W2's from my employer, but I also want to report a certain amount of money for self-employment. Would I have to file separately? If so, how is that done?


Also, how do I upload expense receipts for when i'm filing my taxes online?