Go to the official site (see related links.) For a one-time payment, you get the latest version of the game and all it's features, and future updates. However, the classic version is avalible for free at the official site too.
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No
Minecraft is a onetime Purchase not every game is a pay to play...pay to play meaning you pay per month to play.
You can pay for minecraft in any currency: it automatically converts. In pounds sterling it is around £13.
No, you only have to pay to upgrade to premium.
You need to make an account and then pay for Minecraft and download it.