Help finding everything i would need for this setup.

[Im_Lambo]

Hello, i am new to car audio so i don't know that much yet but im going to be getting 4 sundown SA series 12"s and wondering what i would need to power it all. I was looking at the Crescendo Audio BC3500D for the amp so 3500w power, would i need a new alternator? new battery i have no idea i have a 1999 grand prix gtp. help with suggestions if i should get different amp or whatever other parts i would need to make those 4 subs play well.

I have one 12" kicker compR right now but i really want those 4 subs for a lot louder bass.

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