Wiring for sub and speakers!?

I currently have have two 6x9 speakers in my cars back and i was wondering how i would wire them to a amp with two subs to get more power out of them. Also any suggestions on buying an amp with two subs? price range 200-300
Update: 6x9 are crappy walmart ones but they sound really great
i have this head unit
Update 2: Edit: I want to have two subs hooked up to an amp for the bass and if possible my two 6x9 for more power, i also need help picking out and buying amp and subs.
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