New setup from BestBuy. Help, no idea where to start.

Hey guys. I have a 95 Toyota Camry sedan. One day my back speakers stopped working. I'm looking at getting some new speakers sub, amp. I already have a aftermarket deck, so I should be good here.

The thing is, i'm an employee of best buy, and I may or may not get some discounts. I'm wondering if anyone could 'build' a few good systems and I can choose depending on what the price range is with the discount.

Thanks guys!