Leverage NOT ideal?! Is it?

[Dave Mills]

I have a rental property that is paid off, I want to use the equity to get another one. However I don't understand the concept of buying bunch of properties with equity, isn't that creating more debt? Your cash flow is going towards paying of the loan, how is that positive cash flow? Or how is that building wealth, when you are in debt up to your neck? Can someone please explain leverage before I make a huge financial mistake?