How to hire a personal care professional?

A few days from now, our dad would be sent back home after months of being in the hospital. Since my siblings and I are out almost all day because of our work, we’re thinking of getting a home care professional for him. We found several prospects from this personal care Wolverhampton provider, but we aren’t really sure how to hire the right one. Can you give us specific criteria for this so as to avoid an inept person to look after our father? What are the things we should consider, maybe their experiences, credentials, or age