What do I need for the interior and exterior care of new cars

Hello, I’ve seen and read http://www.motor-talk.de/…/…em-budget-of-ca-100euro-t5336465.html, but it’s about a used car, which is why I hope it’s ok to create a new thread. I’ve been using the Focus ST as a new car for a few days. I’ve read the interior in as long as a “care” for the leather seats is sufficient for the first time after 6 months, so it doesn’t matter here (if that’s true). The paint is sealed. Now I want the car not to see a wash road from the inside, because these “micro scratchers” from my old man have disturbed me very much. It is Slate Grau, Unilack. I have no experience with care/cleaning so far. So can you list me here a list with the required (there is nothing left but factory rim cleaner for black metallic 19″ rims) things? In budget terms, I was happy to land at a maximum of 200€ – is that over aupt possible? And what would be important – how do I use which detergent right? Is it important/are there tips whether you start at the back or at the front, techniques like “cleaning”, “waxing” and “polished”? I’m going to vacuum the car right away – do I have to be careful about scratches and the leather seats because of the vacuum cleaner tube? Greetings and thanks for reading up to here. Greetings, Carlos