Summer job..

[Chelloa]

Well, summer is just around the corner. I'm thinking about getting a job over the summer, to get some working experience. I'm just wondering, is it easy landing a job during this busy time? Also i'm not completely sure how I should go with this. Should I submit a bunch of job applications online to stores nearby? Or should I go to the stores in person and try to get an application.
I've never officially worked in my life, so i'm not sure what the procedures are. Can someone give me some information on it?

Also i'm 16 years old. Is this an eligible age to work? I live in Sacramento California.