help me build a pc

Hello, I am planning on building a PC and would like some recommendations so I don't overspend or make any mistakes on compatibility.

I have a budget of £1,000 to no higher than £1,200. I would be using the computer for more demanding designing programs as well as some casual gaming. My partner will also be using it but they will be doing more intensive gaming and designing.

So this is where I need your help. I know I would like an AMD Ryzen 7 5700x, in a fractal north case and I want a mostly white colour theme. I would like it to be with an AIO water cooler but I don't mind it being fan cooled. I am not crazy about a lot of RGB but I would like a little.

Any help would be much appreciated :)