I have paid cash for the houses that we rented out so I cannot answer that particular question however I can give a few tips that might help.
It is not that easy to make money by being a landlord. Having a certain temperment and being very handy would help greatly.
Around here you tend to look for houses that are way underpriced and use them as rentals. I read one time that you should expect to charge 1% of the purchase price as monthly rent to make money. $100,000 house $1,000 a month rent etc.
The lower rental properties seem to generate the most expense (older and more in need of repair and renters who sometimes are less than reliable).
Nothing quite like getting a call late on Saturday on an overflowing toliet and several abusive phone calls following until you can get a plumber there on Monday afternoon (he would not come any quicker to our private home either). $300 later the diapers that they flushed were removed. Good luck trying to recoup the fees, at least for us.
BTW, the only time we really made money on some of our properties were when they were empty and we were able to take a tax loss. Is why I am no longer in that business. I am neither handy nor tough enough to be a landlord. When I was a renter I used to turn the heat down (was included in the rest way back when) and do some repairs myself but I never ran into a renter like I was. Good luck.
BTW, if you have been watching those late night tv commercials you might want to get real advice from people who are in the business.
Slightly Goofy