Jobs at small Portland companies nobody posts about - 10 weeks in

I asked around at a community meeting and got three leads. This is my first time dealing with any of this. They prefer people who can start within a couple of weeks. What do you write in a cold email?

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.