Hello guys,
  I need some help here before I start build my own custom pc, actually I have low knowledge about pc,(but I know little)
So, i'm buying parts separately one by one(secondhand) from mudah,garagesale etc.

CPU
Processor: Intel i5 2500k (Already buy)
HDD: 1TB WD Blue (Already buy)
Motherboard: ASRock  H61 Pro BTC (Not buy yet)
RAM: 8GB(2x4GB) kingston HyperX beast (2400MHZ) / KHX24C11T3K2/8X (Not buy yet)
PSU: Corsair VS Series VS550 Power Supply / or Cooler Master brand? (Not buy yet)
Casing Chassis: Armaggeddon Tomo T100 Chassis (Not buy yet)
Graphic Card : No budget, so use built-in atm.
DVD-ROM: use from old cpu.

so which you can see, I already bought processor and hdd, other parts I dont buy yet because I dont know it will be match with processor, ram etc. and because I dont know about that socket type, like 775, 1155, ddr etc.
So again guys, all parts above can I buy them and it will match perfectly? or I do need change some?

Thanks