i want to be a landlord?

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ok im thinking about buying a 2nd home and renting it out. do i have to get any legal stuff from the courthouse etc in order to legaly rent out my house?
what is landlord or renteres insurance?

what is the most valuable info i need to know and aquier before i place the home for rent ad?

if i allow them to have a dog and it bites someone is it my fault because i allowed them to have the dog?

smokers would i probley lose tenets if i say no smoking? what if i say outside only? what if i see ashtrays and ciggs in the home? can i evict them for smoking in the house even tho i dont actually see them?