there are some diy with pictures around think, but basically you just route new wire to your door speakers and tweeter up front then when they are connected you simply run the wire back(not next to the power cable by the way) to your amp and connect it there.
Then you can run the rca's from your amp up (and keep these away from the power wire too especially just run them up the passenger side underneath the plastic runners) to your head unit and just plug them in.
heres one I found---
Front Speaker Install