Whats the best way to make my rentals work for me?

[BRANDON CHAMPAGNE]

I have two rentals currently...I have roughly 6 years left on loan. I want to purchase more but wanting advise on how to do so. Should i see about doing a line of credit against houses? Or just try and do bank financing? Whats the secret to aquiring so many rentals without putting all kind of cash down? You see all these investors with 40-50 properties...how do you aquire that? Thanks