Home Network with Vonage and Cisco IP Phones

I have a couple of IP phones that were given to me. I use Vonage at home and have a simple network that is served by TimeWarner Cable... What are the steps involved in using the IP phones as extensions? I am not to bright when it comes to IP Telephony but if you talk slow I will get it. My setup looks like this;

TWC --> Cable Modem --> Vonage ATA --> Linksys Router --> PCs

Now I want to add these phones to the setup. I need power to start with but I think there is a whole lot more than that.

Please help if you know how!

Thanks much, John M.

Oh, and the phones are Cisco 7960's