Learn a bit then go on-line if you are serious about your car detailing, if not then the Supercheap type of brands will do the job but at a much limited standard, it all depends on how much you want to put into it. I don't drive my cars much so the effort is worth it for me, for example I can wax a car and because it's garaged and rarely driven I'll won't have to wax it again for 10 years or more, just a 2 or 3 bucket wash now and again and a bit of detailer spray and they look great.
I also do my own paint correction with a machine and hand wax using just my fingers but I'd recommend you see a pro regardless of what direction you take as I'd be surprised if that black car isn't full of swirls that need removing.
There is plenty of good advice already been given in this thread and products that will do the job, it just depends to what standard you're shooting for.
My suggestion is get the painted surface looked at by a profession and ask for a quote, it costs nothing to talk to these people and if you don't want to go with it then walk away.
https://detailcentral.com.au/
https://www.carcareproducts.com.au/
https://www.waxit.com.au/
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