I have an A4 2007 B7 and i have Bose speakers and RNS-E. Want i want to know how can i run wires from the front to the boot so i can MY own sub and amp in if i can

Also i have Bluetooth phone kit and a cd changer in the glove box is it possible to connected an Ipod doc up with out losing the changer? If so what do i need and what is the BEST adaptor to use?