Building own PC (UK)

Hello! Maybe someone can advise on a custom PC build. One of my folks wants to build their own pc with a budget between 800-1,000.
I, honestly, have no much experience with building computers, neither too sure what parts to choose. They basically need a decent computer to smoothly play video games on and do some digital drawing. They sent me a screenshot of what parts they chose so far, but I am on sure so, perhaps there are some experts around to advise?

Screenshot of their chosen parts:
http://prntscr.com/1qevjsy

They chose those parts through pcpartpicker, but maybe there is another site where they can order parts and have already pre-built computer? As they have no clue how to build it either...

Looking forward to your replies

I think this should be good byt i would suggest 1650 to 1660 ti and processor to ryzen 5 3600

Putting it together is easy just use youtube and you learn some.

PCPartPicker, OverclockersUK, or you can just simply pick the parts on amazon

I dont know much about how much everything is in the UK, but I know in America I feel that it is a better deal at the moment to buy a used pc off of the fb marketplace. gpus are inflated right now imo.

PcPartPicker wicked good site, will tell you whats not compatible and find the best deals on parts