I am planning on building a gaming pc and I wanted help to figure out what parts are compatible.

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all kinds of problems
CPU, RAM and motherboard will not work together, board is intel, CPU is AMD and the RAM is DDR3 which is older, PSU is basement entry quality and I suggest you avoid.

a suggestion.
PCPartPicker part list / Price breakdown by merchant

CPU: AMD - A12-9800 3.8GHz Quad-Core Processor (£112.40 @ Amazon UK)
Motherboard: ASRock - AB350M-HDV Micro ATX AM4 Motherboard (£65.41 @ Amazon UK)
Memory: G.Skill - Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (£59.30 @ Amazon UK)
Power Supply: Corsair - CXM (2015) 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£48.97)
Monitor: BenQ - GL2450HM 24.0" 1920x1080 60Hz Monitor...
all kinds of problems
CPU, RAM and motherboard will not work together, board is intel, CPU is AMD and the RAM is DDR3 which is older, PSU is basement entry quality and I suggest you avoid.

a suggestion.
PCPartPicker part list / Price breakdown by merchant

CPU: AMD - A12-9800 3.8GHz Quad-Core Processor (£112.40 @ Amazon UK)
Motherboard: ASRock - AB350M-HDV Micro ATX AM4 Motherboard (£65.41 @ Amazon UK)
Memory: G.Skill - Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (£59.30 @ Amazon UK)
Power Supply: Corsair - CXM (2015) 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£48.97)
Monitor: BenQ - GL2450HM 24.0" 1920x1080 60Hz Monitor (£99.98 @ Amazon UK)
Total: £386.06
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-12-03 21:15 GMT+0000
and this case
https://www.amazon.co.uk/DYNAMODE-DYNA-GC375-LockStock-Gaming-Computer/dp/B01KG6NA22/ref=sr_1_4?s=computers&ie=UTF8&qid=1512335602&sr=1-4&keywords=ATX+chassis
a few pounds more than 400 but staying with amazon.co.uk cost a bit here

CPU can be replaced with ryzen and a GPU later. the motherboard is ryzen ready, 2 x the RAM in dual sticks for dual channel memory. much better quality PSU. the A12 should be a bit faster than the a6.
 
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