Dont worry brother.. there is learning curve in Car audio. No one gets a perfect setup in 1 day. You need to learn about the positives and negatives. Yes everyone is right, with Such a huge Woofer i mean BOOFER. you need A bigger generator to charge your batteries and then a Wider and Bigger Box which is deisgned only by GURUS. Different Boxes have different, e.g some of them have great low, some of them have great highs.
So just relax take some time and be ready so spend more! and yeah Amplifier also takes a big credit