Finding out what amp i need with my sub?

[speedywannarace]

So i want to get a RE Audio SXX15D2 15" subwoofer, and i dont know what kind of amp i need to power it. if i want to get new speakers as well do i need to get a seperate amp or can it all be put on the same one? im really clueless about this stuff so i kinda need it to be put into simple terms.

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