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how many years will i have fun with atleast?
Hard to tell. It's different from person to person. One will be fine with low settings in games and one requires maximum settings for "fun".
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What parts you would be changing and to what?
Power supply: This is way to overkill your system will be requiring like 500W at max peak.
Tune it down to a 650-750W (gold or platinum depends on your e-peen).
Motherboard: Quite an expensive board, for the extreme overclocker and for the aesthetics (You are going to slap an huge ugly cooler on top for it anyways)
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(correct me if i‘am wrong... the Higher the Capacity ––> the faster my PC is working/running?)
The amount doesn't necessary translate into a faster experience, like a better CPU would.
You will be able to do more multiple things at a time. 16GB seems like the sweet point these days.
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Network Card
Asus AC3100 for great W-Lan connection
Not sure what NIC is referring to there, AC3100 is a WIFI speed not a model number. Could as well be a Router you are talking about.
Storage: Go for the 970 evo over the 960 pro. Specially in a consumer PC the 10 year warranty and larger TBW is more for heavy usage like data servers.
Don't you need more than 500GB storage?
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Disk-Reading/Writing
Asus BD RW BW-16D1H-U Pro
No judging. But do you ever use a DVDRW? I haven't had a DVDRW in any of my builds or laptops for the past 5+ years. (You might for the music production?)
What case will you be using?
An about the sound card, I can't help there, that's really not my area. But I've heard external DAC's is the way to go.