Hey all, i literally joined today and need some advice because im new to the car audio world and it is somewhat overwhelming. I have 3 questions

My question im planning on buying subs and im wondering if i should get 2 12" (Alpine SWR-12D4) or (Alpine SWR-12D2). Then My next question is can i just get one amp to run both of them? if yes or no, what amp should i be looking for such as the type of channel or whatnot. My final question is when i finally get the subs and amp picked out, i want a ported sub box(should i get it online or local, and what brands are good?) and need to find a place to install them for me(or should i do it myself?)

I live in Alaska btw
My car is a Honda Crv 2007