I own a home, I want to rent it out. What do I need to do in order for it to be legal?

I own a house and I want to rent it out. I want to know what I need to do in order for it to be legal. I do not want to get screwed over by some tenant with a technicality. Are there steps I need to take in order to get it registered with the state of Texas or what? If you know please inform me.
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