Renters have more rights than landlords. Get a STRONG rental contract. (many examples online)
Video the whole property, inside and out, in case there is a dispute on damages.
Get references and check them out. There is a reason they are not living there any longer.

Just a word of caution. I stopped renting to people with children. If they get in and decide not to pay rent, it can take up to a YEAR or more to evict them. Can you afford no rent for a year? Of course not many people are like that, but it has happened. Especially during Covid when the government said you could not evict tenants for non payment of rent.

As for LLC? I didn't, but that was before Covid, and when landlords still had some rights. Getting one might cover your ass somewhere down the line.