Coating with 2k-canned paint

Hello, I hope I’m here in the right subforum, I didn’t find anything that could fit better. I want to paint my car completely in black high gloss with the can. Please don’t give any advice like “let it be the same” etc. Werds simply risk with can. Now the question, how do I do it best with the lacquer structure? Can I use a 1k thickcoat and then the 2k clearcoat on it? I have often read that this doesn’t necessarily work out. On what basis should the 1k varnish be ? Water, acrylic..? Since the 2k clear varnish is from Spraymax, can the 1k lacquer from Spraymax also be added or? Can I take the 2k lacquer High gloss Black from Spraymax without the clear varnish? I think there is a high gloss, is a clear varnish layer not provided or? Would just like to get away as cheaply as possible and do not waste unnecessary money. Thank you very much.