This will be my first computer build, so I am pretty much lost on where to start even. I want to build a PC that is set up for some mild gaming, I'm not talking about running huge games just something like garry's mod. I also want it to be something I can use for music and movies, something that I can hook up to surround sound and will have good sound and something that isnt going to be sluggish while I'm using it. I feel like it would be pretty simple, and I also have a custom built computer that my motherboard just went out on (I did not build it) so I will be able to use some parts from that. So, any suggestions on what parts would suit me the best and what I need?