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No one can teach you how to rent houses. If you have the money to buy the houses you want to rent then you set the rents according to market prices. You can determine this by researching homes or apartment in your area that you would like to rent.
Knew landlord tenant law for your local community and get involved. You can usually find this under consumer protection laws in your community or state. Sometime local communities have laws or ordinances that reach further that the basic state laws the state mentions.