Audio help with converting an Xbox to a monitor?

So, I am completely dumbfounded as to what I should do about my most recent technological nuisance.

I just inherited a computer monitor from a friend, that only has DVI/VGA inputs, so I bought an HDMI to DVI cable to connect the monitor to my xbox.

This monitor LITERALLY has three slots on the back of it, one for DVI, one for VGA, and one for the power source. Now, as one can infer, this leaves no option for audio while gaming… As the monitor doesn’t even have speakers built in.

My question is… How can I get audio from my game, while still using this monitor as a screen? I am open to maybe buying external speakers… But there is no port for them on the monitor, and no port on it for the xbox either, to my knowledge.

I am also open to buying new gaming headphones… But I don’t know which ones I WOULD get that would give me game audio, without there being any way to transmit audio to the monitor.

I’m really just clueless to the situation, and in dire need of help! Thanks for any suggestions.