For many of the elements of your analysis, you are going to rely on your own brainstorming and knowledge of the topic, while also looking at information sources (online news, organizational websites, other web sources) to discover the above elements of your given topic.
Once you discover the elements of each section, those may become keywords in your search. You may also need to brainstorm additional alternative keywords for your topic. For policies that currently exist, your best searching will take place online and use the site: feature to limit to government and organizational sites.
Alternative keywords sample: e-cigarettes, vaping, teenagers, adolescents, young adults, youth
Behavioral factor search sample: "peer influence" AND vaping AND teenager
Equity and disparity search sample: vaping AND "health disparity"
Policy search sample: vaping policy site:gov