Small employers hiring around Tulsa

A friend who works at a local manufacturer says there are openings not advertised online. This is my first time dealing with any of this. One is a print shop, one is an accounting firm and one is a clinic. What do you write in a cold email?

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

Small employers often hire on recommendation. Ask neighbours, former co-workers and your library.