For general information about advertising to certain consumers, try searches again in the recommended databases.
An example search could be Millennials AND frozen food.
Find information on people related to age, income, race, ethnicity, occupation, etc. Generally the information is organized by location: country, state, city, etc.
The database eBook Collection is a rich resource for recently published books about advertising. Examples include:
Consumer Behavior 2015-2016
by
Miller, Richard K., Washington, Kelli D., Richard K. Miller, & Associates
Who's Buying Information and Consumer Electronics
by
New Strategist Press (Prepared for Publication by)