How to Make Phone Calls via My Modem

I have a Dell 8300 that came with an Intel 537EP modem (chip??). I would like to be able to use my PC just like I use my regular phones. I envision answering an incoming call by clicking on an icon, speaking through the microphone on top of my monitor, and listening to the caller via my PC speakers. I would also like to make phone calls by normal dialing. I have no idea how to hook all this up. Where can I find instructions?