For question 1, sorry that I’ve no idea what the whole sentence means, so I can’t answer it.
Question 2: I’m very interested in the custom of Yunnan ethnic minorities.
Question 3: “多少” means “how many” or “how much”. In this sentence, as “多少” is followed by “钱”, which is uncountable, so it means “how much” here.
Hope that you’ll find my answer useful.