Tax Form for Receiving Income in US Dollars From an International Online Site

I am hoping to sell printables on an online platform based in the UK.  However, I am currently living in the US, am a US citizen, and the income I would receive as a salary would be deposited to my account in the US.  What form would I need to fill out next year for tax season (for that source of income) since I would be receiving the income in US dollars but from an international online site?