Car Audio Noob Needs Help

ok i’ve been speaking with some friends and the set up is going to be a set of 4 kicker speakers for $100(its not the best but they’ll do til I can afford something higher quality), then another friend who does car audio for a living says he can get me a set of subs and an amp that will “blow my ears off” for $120, past that i’m just gonna buy housing for the subs, wiring, and a pioneer head. Like i said i’m not interested in an amazing system, i just want a system, right now all i have is a radio with no cd or tape deck and four shitty speakers