I was wondering if anyone had any advice on cover letters or if it would even be relevant to my situation.

The sort of job I'm looking for isn't one that's advertised. You go into the store and ask if they're hiring (or call etc.). I'm working on an updated resume, but I don't know if I need a cover letter too. It seems like it would be too "official" for a job that you just go ask about.

Any other advice for "applying" for non-advertised jobs would be appreciated. (I'm not sure you can officially apply for a job that doesn't officially exist).

I really wanted to be my own boss and start essentially what would be my own business...but I don't have the money to afford the real estate needed to do it as my only job.