There is a choice of 1 or 2 or 3 or more days tickets. There is also a choice of standing in line for hours for each ride or Express Pass. It is better to call or check their website. The Wizarding World of Harry Potter covers two parks, Universal Studios & Adventure Island. I recommend the Two Park Ticket with Express Pass. As far as how many days depends upon one's schedule & one's budget.
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It is included in the Universal tkt. Around 100usd
You just need to purchase a universal Hollywood ticket and that grants you access to the whole park plus the wizard world. No extra ticket or charge
It is included in the price of your universal studios ticket
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