Truck Audio Help Needed

So car audio is some I know nothing about. I was going to see if anyone could help me figure out what speakers to get and help me instal them and my deck. My truck already has an amp in it. I'm not sure How it is hooked up since it was already there when I bought my truck. The truck still has the stock head until and what I think it the stock speakers. Anyways I picked up a deck the other day and was hoping someone new how to hook everything up. I have the wiring harness and dash kit also. I need to get speakers next. They don't need to be high end or fancy. just something sounds pretty good. I was hoping to reuse that amp since its a 4 channel amp.

Here is what I have:

Deck
http://www.kenwoodusa.com/Car_Entertainment/In-Dash_CD_n_DVD_Receivers/1-DIN_CD_Receiver/KDC-MP145

Amp
http://www.audiosavings.com/product...-920-WATT-4-CHANNEL-CAR-AMPLIFIER/XA-485.aspx

Speakers:
Need help finding something

 

Never-mind found someone on another site that helped me find what I needed and help with the instal