advice on how to purchase duplex number 2

[Kendell Wolfe]

ok so I have recently made my first purchase of a duplex here in Texas. I can afford to make the monthly payment out of my own pocket but my question is should I try and pay off the loan with the income from the rentals and use this duplex as collateral for my next purchase or should I just save the income and use it as a down payment on my next purchase? please help!!

Kendell