One of the really fun things about exploring public health and policy is that you get to pull information from so many different kinds of sources! You're not just using using research articles, you're also synthesizing historical and contextual information, statistics and data, white papers from advocacy and non-profit organizations, reports from government programs, legislation, and more!
Since you're probably be going for interdisciplinary and/or intersectional perspectives, I recommend starting with a keyword search in Smart Search, and then as you get more comfortable with the topic, more into some more specific sources - likes the ones on this guide.
Got questions about resources, search strategies and more? Contact your librarian!