Hey sigep611, welcome.
You'll not want to put double posts up, annoys people, takes up space. Also, the search feature is helpful. Here are my tips on a black car from a couple of months ago, similar question as yours:
Almost any wax is good, though some are better. Sealants last longer, and make a great base for wax. I don't know Blackfire or Menzerna, but Klasse All-in-One (KAIO/AIO) is great. The Sealant Glaze, though, is difficult to use, and may not be a beginners tool. Here are my tips if you want to keep your car sharp (black is impossible):
1. Always make sure every applicator and microfibre towel is spotlessly clean and without dust--always.
2. Polish as little as you can; wax/seal as much as you can.
3. Wash with the slickest soap, the least harsh chemicals, without letting the car get too dirty.
4. Wash with a grit guard or several buckets.
5. Wash with a lamb's wool mitt--not synthetic or a brush. If you can't do this in winter, pay for it at a shop and watch them do it.
6. Park in safe places that aren't crowded.
7. Wear an apron or don't work on our car with a belt and buttons.
8. Get the plushes mf's and best products you can find. If money is an issue, Natty's Blue is great, preceded by EX-P. If not, go with Souveran; I love them both.