I am 18 too, and my parents gave me a 96 X- sport so that I can get around. I am putting my bass end in first so that I can focus on the best stuff. Put the mids and stuff in later- it is better to approach this in mudular form. OK here is what I have-
2 of each:
-KX 1200.1 amp
-Kicker S12L7
-1 farad caps
each sub is mounted in a full plexiglass box made from 3/4 inch plexi- 2.5 cubic foot ported boxes with neon in them. best mix between spl/sq
your best bet would be to find a dealer to buy directly from as did I. I have a few friends that deal Kicker stuff so I saved a whole pile of money. Try to buy at cost- if you cant get a job for a while at a car audio shop- it is a fun place to work and you get deals (cost + 10%)
so the L7's I told you about- they retail for 400 US. get them at cost they are around 75, plus 10% of that, so like 90 bucks at most.
My amps retail for 600-900 US each- know someone on the inside track, or work at an audio place and they are yours for 150$
My point is this- try to get the best deals on the best stuff. my audio system was likely cheaper- or the same price as yours. well for my bass end anyway.