Building a Pc looks complicated but in truth it's just modules that you plug together.
These are a case , a power supply, a motherboard , a CPU ,memory , a graphics card ,harddrive or ssd drive . And software currently recommend Win 7 or 8 or Apple Yosemites And a DVD drive.
If you are wise you use components that work with Pc and Mac . That way when you boot up the computer you choose if you want your computer to be a PC or Mac . You can choose each time you boot your computer as to which operating system you want . Some people run windows for business ,then reboot ,when they want to use graphics packages , or maybe there Daw. Personally I have both but I prefer Pcs .its the tweaker in me . Macs kinda say your doing it my way lol. But that's personal and don't want to get into the macs are better than pc battle . It's what ever suits your needs best. Here's an image showing some of the components required including some spelling errors not mine ,besides I can make my own spelling errors lol. . If there's interest in this topic I'll add more info later. One thing if you want to make a daw or build a PC to use with pro tools , be careful because only certain components are recognised by pro tools you have to stick to tried and trusted builds more of that later
Best Wishes
Kimball