Djlewis12 :
apcs13 :
You're fine with just an HDMI cable, unless the monitor lacks speakers or they are bad. There is no need for external speakers unless:
A. Your monitor doesn't have any
B. Your monitor does have speakers, they just are awful
C. You are a huge audiophile or need high-quality audio
If my monitor does not have built in speakers what kind would i have to buy to play sound?
Any as long as they can plug into your monitor. You can grab some decent cheap ones for $30 or $40 with some good looking (I saw a high-rated item on Amazon for around $20 a little bit ago, there are low-priced options) or you can go big and grab yourself a nice set. But, that's entirely up to you. Personally, I am not a huge audiophile, right now I am using the speakers on my monitor which aren't bad at all, so I would shoot for maybe a $40-$60 set, that would be pretty good for you it seems.