Most of our tenants were great. We had only one who caused any damage (deducted from her deposit, and her tenancy was not renewed).
Ask for previous landlord and current employer references and check for yourself (by phone) that they are genuine. You will encounter fake references, smartly dressed shameless liars, dodgy vibes etc; just trust your gut and sidestep.
Make sure the building and fittings are properly insured for letting.
Inventory everything down to the last teaspoon; and photograph all furniture, fittings, carpets, etc; even the bathroom.
I recommend you don't aim for being pals with tenants; better to keep it polite and professional and stick to the absolute letter of landlord correctness. Gas safety checks up to date, soft furnishings fire certificated, always serve the right tenancy forms at the right time, properly signed and dated. Keep a list of recommended tradesmen for emergency repairs.
How you present the house and contents sets the tone you hope they will live up to, so make sure it's sparkling at the start of tenancy. I provided a one-off introductory set of basic cleaning materials, paper towel , bin bags, fresh soap and loo paper in the bathroom. IKEA is a great source of cheap plain smart sets of crockery, pans, glasses and , bedlinen etc.
Keep records of all expenses and every tenant communication.