Suggested Research Method/Why

I plan on making a survey relating to fast food in today's society. I want to figure out how to see what people in society enjoy fast food the most and see if there is a change in the demand of fast food based on age and gender. I might also ask a few questions based on the race of the person to see if more ethnic people tend to go for fast food. I think that the majority of teens will go for fast food more because it is easily accessible and requires no culinary skill.