Looking for opinions and clarification on first build

Build Help/Ready:

Have you read the sidebar and rules? (Please do)

Yes

What is your intended use for this build? The more details the better.

Moving from Mac and looking forward to the games I've missed out on. Software other than gaming will be Sibelius, ProTools, most Adobe creative programs, having fun with Rainmeter. I have an external soundcard already.

If gaming, what kind of performance are you looking for? (Screen resolution, framerate, game settings)

I was waiting until Bannerlord release to build but I might be dead by then, so looking to run HotS on high settings (those ragdolls) 1080p at 60fps. Would also like to run Elite Dangerous on medium settings.

What is your budget (ballpark is okay)?

~£1000 - already have all peripherals other than monitor.

In what country are you purchasing your parts?

UK - Northern Ireland

Post a draft of your potential build here (specific parts please). Consider formatting your parts list. Don't ask to be spoonfed a build (read the rules!).

PCPartPicker part list / Price breakdown by merchant

Type	Item	Price
CPU	AMD - Ryzen 5 1600 3.2GHz 6-Core Processor	£178.50 @ Amazon UK
CPU Cooler	be quiet! - Pure Rock Slim 35.1 CFM CPU Cooler	£19.92 @ Aria PC
Motherboard	Asus - PRIME B350-PLUS ATX AM4 Motherboard	£72.56 @ Amazon UK
Memory	*Crucial - Ballistix Tactical 8GB (1 x 8GB) DDR4-3000 Memory	£73.19 @ Amazon UK
Storage	Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive	£86.40 @ Amazon UK
Storage	*Seagate - Constellation ES 1TB 3.5" 7200RPM Internal Hard Drive	£31.99 @ Aria PC
Video Card	Asus - GeForce GTX 1070 8GB Video Card	£366.97 @ Amazon UK
Case	Corsair - Carbide 400C ATX Mid Tower Case	£78.60 @ Aria PC
Power Supply	Corsair - RMx 550W 80+ Gold Certified Fully-Modular ATX Power Supply	£78.97 @ Amazon UK
Monitor	LG - 25UM58-P 25.0" 2560x1080 60Hz Monitor	£159.98 @ Novatech
	Prices include shipping, taxes, rebates, and discounts
	Total	£1147.08
	*Lowest price parts chosen from parametric criteria
	Generated by PCPartPicker 2017-10-16 19:59 BST+0100

Provide any additional details you wish below.

• Are there any obvious flaws/missing components? I see that PPP observes no compatibility issues.

• I see that the motherboard comes with an DVD, what is this for?

• Is the most common method of installing Windows 10 downloading to a pen drive from another system?

• Does the CPU/Cooler(?) come with thermal paste and if so should I invest in better stuff?

Any observations would be very welcome, apologies for any ignorance/nonsense above.

Thanks.