Hello /ask/

I'm going to apply for a job at my local Safeway, there's currently a Baker Helper position. I previously worked at a gym for 5 years doing various things but I didn't require a real resume to get the job. So I'm wondering what I should put down for skills, both on my resume and the online application (which requires you to upload your resume).

Also looking for general resume tips. I've only ever had the one job and nothing beyond a high school diploma, so my resume is destined to look pretty measly.

Thanks in advance.