Okay, so I'm a complete beginner when it comes to car audio, and I plan on upgrading my system in the VERY near future. I want upgrade my two front speakers and install a sub in the trunk. Basically, I know I need the speakers, sub, box, amp, and wiring. But what other details? What type of amp do I need for this? Do I need a separate amp for the speakers and the sub? What type of wiring kit do I need? Is there anything else that would make a noticeable difference without hurting the wallet too much?

 

There are numerous informative threads in the "Interior and Audio" section that have detailed everything from how to tear your interior apart, run wires from the engine bay, what speakers to buy or not buy, accessories that will be needed, and how to wire up subs. You will have to scroll through and read a few. They are complete with pictures and even the websites or stores used to buy the parts, some with what prices you should expect to pay. If you have any specific questions that arent answered by those threads then just post them.

 

Crutchfield.com has some good beginner guides you might want to read.

 

I'd also try to find someone who has actually installed amps and speakers in cars to help me out.