how to finance my properties?

I have just purchased two CF positive properties and am now going through the process of financing these. I am using the equity in my home ( was really unsure whether to do this or sell shares and use cash so i guess that is my first question ). I have been advised that interest only loan is the way to go but as I understand it in steve’s first book he uses P and I loans. Which is best and why? If anyone has a good finance broker/bank/etc in perth who can think outside of the box I would love to get in contact with them!