[SOLVED] First time buying pc - thanks for any help!

Solution
You could build a significantly better system for cheaper.

PCPartPicker Part List

CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor (£147.90 @ Amazon UK)
Motherboard: MSI B450 TOMAHAWK MAX ATX AM4 Motherboard (£119.99 @ Amazon UK)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory (£90.08 @ Newegg UK)
Storage: Crucial P1 500 GB M.2-2280 NVME Solid State Drive (£64.41 @ BT Shop)
Video Card: Zotac GeForce GTX 1650 SUPER 4 GB Twin Fan Video Card (£152.47 @ Amazon UK)
Case: Phanteks Eclipse P350X ATX Mid Tower Case (£64.95 @ Amazon UK)
Power Supply: Corsair TXM Gold 550 W 80+ Gold Certified Semi-modular ATX...
You could build a significantly better system for cheaper.

PCPartPicker Part List

CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor (£147.90 @ Amazon UK)
Motherboard: MSI B450 TOMAHAWK MAX ATX AM4 Motherboard (£119.99 @ Amazon UK)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory (£90.08 @ Newegg UK)
Storage: Crucial P1 500 GB M.2-2280 NVME Solid State Drive (£64.41 @ BT Shop)
Video Card: Zotac GeForce GTX 1650 SUPER 4 GB Twin Fan Video Card (£152.47 @ Amazon UK)
Case: Phanteks Eclipse P350X ATX Mid Tower Case (£64.95 @ Amazon UK)
Power Supply: Corsair TXM Gold 550 W 80+ Gold Certified Semi-modular ATX Power Supply (£64.98 @ Currys PC World Business)
Total: £704.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-06-19 00:39 BST+0100


As for water cooling it's pointless for that CPU and there is the risk of it leaking and destroying the system.
 
Solution
You could build a significantly better system for cheaper.

PCPartPicker Part List

CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor (£147.90 @ Amazon UK)
Motherboard: MSI B450 TOMAHAWK MAX ATX AM4 Motherboard (£119.99 @ Amazon UK)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory (£90.08 @ Newegg UK)
Storage: Crucial P1 500 GB M.2-2280 NVME Solid State Drive (£64.41 @ BT Shop)
Video Card: Zotac GeForce GTX 1650 SUPER 4 GB Twin Fan Video Card (£152.47 @ Amazon UK)
Case: Phanteks Eclipse P350X ATX Mid Tower Case (£64.95 @ Amazon UK)
Power Supply: Corsair TXM Gold 550 W 80+ Gold Certified Semi-modular ATX Power Supply (£64.98 @ Currys PC World Business)
Total: £704.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-06-19 00:39 BST+0100


As for water cooling it's pointless for that CPU and there is the risk of it leaking and destroying the system.

Thank you so much for the build! Is windows 10 difficult to download?
 
Thank you so much for the build! Is windows 10 difficult to download?
Your welcome. Downloading/installing Windows 10 is fairly easy, you just need to download the Windows 10 tool to a computer, run the tool program and use a 8gb+ USB flash drive as the installation location for that software. Once it's completed and the new system is built then you can use that flash drive to install Windows 10.

https://www.microsoft.com/en-us/software-download/windows10