PC Building - how to start?

[Migel]

So today, after a few weeks of strange anomalies, I am 99% certain that my main hard drive is about to die. Its from late 2014 and served me well for multiple hours just about every day.
The PC I am currently using is an

Acer Predator G3-605:
NVIDIA GTX 760 1.5GB
Intel Core i7 4770
12GB DDR3
1TB Hard Drive
Windows 8 64x

So not even enough to run games from winter 2016. For my next PC, I want to build it myself. My father keeps telling me not to, that I have no guarantee on the parts and can't return them if they don't work. I have no experience in building PCs, but I think I should be able to tinker something together if I get a set of parts that fit together. But here's the first problem: what is the first part to pick? What do I build my PC around? A logical choice would be the CPU, although I personally always had the biggest problems with my GPU underperforming.

Next up, what OS should I best pick today for gaming? I am currently using Windows 8, and although I can't complain it does have a few downsides.
From my friends I heard that Windows 10 is pretty unstable (Those reports are from a year ago though, don't know how it's now.) I loved the professional feeling that Windows 7 had.
Windows XP will always have a place in my heart but I doubt it's a viable option for 2017 gaming.

Power supplies wouldn't be a problem from what I saw.

So here's what I am looking for in my new PC:

Budget, up to ~1200€

Gaming PC
Should run games pretty good.

Disc Tray
I know this is almost outdated now but I still buy CDs and DVDs, or Retail versions of games.
I guess buying and installing these is pretty easy. Just need a case that could support such a thing.

Future-proof for a few years
Pretty self-explainatory. I don't want my PC to be sub-standard after half a year, which is why I am worried to get a GPU with just 3.0 GB VRAM. While 2.0 is the minimum requirement for the new games, I am worried this might rise soon. (Although there's no way to predict future breaktroughs that might overthrow the entire market)

Multiple monitors
I currently have 2 monitors. I want to have a 3-monitor setup at some point. What is normal for graphics cards? Mine has an HDMI and 2 DVI ports, so it already supports 3.


I think that's pretty much it.

A few side questions:

-What's DDR3 even mean? Is there any difference between getting 2 or 3 RAM sticks?
-What's better, getting 2 graphics cards or a single stronger one?
-If I get a case with glass, I would like to install RGB lightstrips, but the ones I have behind my desk produce quite the heat. I wouldn't feel comfortable having things like that heat up right next to parts that need cooling. Are there lightstrips that do not produce heat?
-How do I get USB ports?
-What do I need to do for my PC to support bluetooth stuff?

[chiefputsilao✖️ping]

https://www.asus.com/Motherboards/Z97AUSB_31/specifications/
asus Z97-A/USB 3.1 has the following usb ports:
Intel® Z97 chipset : 6 x USB 3.1 Gen 1 port(s) (4 at back panel, blue, 2 at mid-board)
Intel® Z97 chipset : 6 x USB 2.0/1.1 port(s) (6 at mid-board)
ASMedia® USB 3.1 controller : 2 x USB 3.1 Gen 2 port(s) (2 at back panel, teal blue)

usb 3.1 is backwards compatible with usb 3.0
if you got a usb 3.1 device, then it will transfer files at max rate
https://en.wikipedia.org/wiki/USB_3.0#USB_3.1

[Migel]

I've been refining the part choice a bit, not on pcpartpicker, but based on what is aviable and cheap in germany.

Another question: where do I get the cables? Are they delivered with the parts, the power supply, or do I order them seperately?

[chiefputsilao✖️ping]

what cables?
if cables to usb 3.1 header on motherboard, then these come from pc case if natively supported for usb 3.1 front panel.

if cables for hdd/ssd: sata data cables come free with motherboard purchase usually 2 free for entry level motherboards and 4 or more for enthusiast motherboards

if power cables for hdd/ssd: they come from power supply unit.

[Migel]

chiefputsi✖✖✖ 上 没什么 老挝 の投稿を引用：

what cables?
if cables to usb 3.1 header on motherboard, then these come from pc case if natively supported for usb 3.1 front panel.

if cables for hdd/ssd: sata data cables come free with motherboard purchase usually 2 free for entry level motherboards and 4 or more for enthusiast motherboards

if power cables for hdd/ssd: they come from power supply unit.

Okay, thanks :D