Small employers hiring around Pittsburgh - any advice?

I asked around at a community meeting and got three leads. There are 10 people counting on me, so I am trying to be careful. One is a print shop, one is an accounting firm and one is a clinic. What do you write in a cold email?

Thanks for writing this out. I went through something close to it 11 months ago, and it got easier once I kept a simple log of every call and form.