Can I get a job at 14?

Okay, so I turned 14 a while back, and my grandparents figured I should try and find a job. It'd be nice to not have to worry about bills and such, but still make money for things that I WANT to pay for. So I need to know if, in Kansas City, Missouri (or KC Kansas if the Labor laws are different) you can get a simple, but official, job, such as a grocery store bagger. Thanks in advance!