New to me RS6 (C7) requiring personalising!

[Jimbololo]

Hi all and Happy New Year!

I'm a new joiner who has recently purchased a black 2018 C7 RS6 which is just incredible. It has the silver window/grill surrounds, roof rails, mirrors, badges etc which I'd like to change to black. I'm also looking to lower it 20mm and swap the Audi 20" wheels for 21" Vossen HF-2 (with spacers and I am clueless when it comes to things like offsets and widths?!?). I'll also need new tires and am thinking about a not-overly-lairy new exhaust system (Milltek or Akro?!?)

In a nutshell I've never tweaked a car before and was hoping you might be able to assist with recommendations for sourcing parts, any considerations I should bear in mind and any tips or suggestions you might have...! I'm UK based and I don't want to go mad or OTT; just make it mine if that make's sense.

Sorry; a standard and generic forum request I am sure - I have searched and read what I can - but if you don't ask, you don't get...!

Cheers