New members. Completely noob

[Duc Ta]

Hi,

I'm a new member here. I currently have 2 props. Have a question that I'm not 100% sure. Sorry for being a noob. It is about the home equity. I intend to use the home equity to buy another props. I'm kinda confused here. So you withdraw the equity from your props then buy the house. 

The confusion here is: 

Does it have to be 100% buy out (buy the props completely without mortgage)? 

Can you have (or is it possible) a mortgage for the property and use the equity as 20% or 25% down payment?

Once again, sorry for being a noob.