PC upgrade (rest of components)

[genericone]

I bought a new GPU (gtx 750 ti) and PSU ( XP600R6 Xilence) for my old PC, but now i want to buy the rest of new components. My budget is around 500 EUR and I also don't have to worry about software.

Can someone suggest any builds or some PC building guides for me?

 

[Aeacus]

Here are the rest of the components including a new PSU since the one you bought is crap.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor (€105.88 @ Amazon Deutschland)
Motherboard: MSI - Z370-A PRO ATX LGA1151 Motherboard (€111.71 @ Amazon Deutschland)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-2400 Memory (€159.99 @ Amazon Deutschland)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€44.40 @ Amazon Deutschland)
Video Card: MSI - GeForce GTX 750 Ti 2GB TWIN FROZR Video Card (Purchased For €0.00)
Case: BitFenix - Nova ATX Mid Tower Case (€41.99 @ Amazon Deutschland)
Power Supply: SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (€64.57 @ Amazon Deutschland)
Total: €528.54
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-27 22:42 CET+0100

Few words

Add your GTX 750 Ti to the build above and for gaming, you're looking medium settings @ 720p.

Reason why all Xilence PSUs are crap is due to the false advertisement. HardwareInsights did a review of the Xilence PSU which belongs to the same series as your bought PSU but it's "rated" for 400W. Expect the same level of performance (or lack of it) from your PSU as well,
review: https://www.hardwareinsights.com/xilence-performance-c-series-xp400r6-review/#Introducing-the-Xilence-XP400R6

Your PC will be much better off when it's powered by good quality PSU. So, i put Seasonic M12II-520 EVO in which is also fully-modular to ease the cable management.
All my 3 PCs: Skylake, Haswell and AMD are also powered by Seasonic. Full specs with pics in my sig.