Small employers hiring around Fresno - any advice?

A friend who works at a local manufacturer says there are openings not advertised online. There are 13 people counting on me, so I am trying to be careful. They prefer people who can start within a couple of weeks.

Visiting in person worked for a trades job. For office jobs, email was better.

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.