Hiring: medical assistants and aides in Phoenix - any advice?

A home-care agency in Phoenix is taking applications for aides with paid training. This is my first time dealing with any of this. Some do not require prior experience for entry-level roles. Do any of these pay for certification?

Thanks for writing this out. I went through something close to it 7 months ago, and it got easier once I kept a simple log of every call and form.