I am new to this but want to buy the Durango &Silverton set. It has ez track but I need to buy additional pieces. My area is wall to wall 176" x 113". The set should have my corners covered and some of the straight lines. How many more straight pieces do I need. Also do I need to run a power wire with several jumps to the track for even power and if so do I need special equipment to attach the power to the track?