I already have a working OOP website. Most of the php is separated from the html. I was wondering if anyone had any tips on how to apply that site into the Yii Framework. >
well there is no hard and fast convertor which will convert your site from traditional OOP model to Yii. You have to do all of it yourself. But you can opt to do it in stages though.
-at mathew commented I must clarify that you have to do it all by yourself and there is no easy way to convert your existing code to what Yii understands