What does it cost to start a cruise business?

I just have been thinking, what would it cost to build/ buy a cruise ship and whats the lowest amount of dollars anybody will need to get started? And

I just have been thinking, what would it cost to build/ buy a cruise ship and whats the lowest amount of dollars anybody will need to get started? And also, could we buy used ships from companies? Thanks!

or:I just have been thinking, what would it cost to build/ buy a cruise ship and whats the lowest amount of dollars anybody will need to get started? And also, could we buy used ships from companies? Thanks!

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