Voldemort allied the Dementors with him. Like when the Dementors were hired as Azkaban guards, they wouldn't drain life force from their Ministry employers or visitors if they could help it, as they already had a large supply of human emotion to feed off of that was given to them.
It's the same principle with Voldemort. He offered up more people than the Ministry, so their allegiance switched, and they'll go after their enemies, but not their employers, as they've been given a large pool of emotion to drain from already.
Curse breaker.
Herpo is the first known wizard so far. Magic, like humanity, is supposed to have originated in Africa, so the very "first" wizard would've been from that region.
I think wizard authorities would have a problem with reports of disappearing Muggle money. Even magical counterfeiting can be traced back.
You can't duplicate money and expect it to last. Duplicated things wear out more easily over time, so if you try to duplicate money, it will deteriorate quickly, which makes it worthless.
I assume you're talking about the movie. In the book, it's more obvious he knows. In the movie I think he's just messing around with them, because he can.
It feels like a bad fanfiction. The intro was promising, when Albus was sorted into Slytherin and was having issues relating to Harry, but I felt that the plot took a dive from there. I mean Voldemort having an heir? Time travelling to previous books? So many things felt off when compared with the rest of the series.
Well every country has wizards, and Australia is a rather large country, so there's probably something offered, whether it be a large school, multiple smaller schools, a correspondence course, or something else.
It's not impossible for Muggles to enter wizard places like Platform 9¾ or Diagon Alley. It's just that they're disguised from the outside, and most Muggles wouldn't bother to interact with them. The child and the parents would be told where to go from a guide (like Hagrid with Harry), and the parents could go through and see them off just fine.
I didn't really like the book, but I heard it's better in play form.