The stock turn signals use 3 wires - 1 is a power wire for the turn signal, 1 is a power wire for the running lights (brown), and 1 is the switched ground that goes through the handlebar switch (black/white stripe).  You will not using the brown wires anymore if your LED turn signals don't include running lights.

Connecting the headlight should be easy.  Yellow is the high beam, white is the low beam, and black is the ground wire.  

Most LED bulbs are polarity sensitive and will only work if you connect the wires to the correct polarity.  The positive wire needs to be connected to the (+) supply wire. You will also need to change your flasher module over to a solid state unit and replace the stock mechanical one - as the LED turn signal will not draw enough power to make the flasher module work.  The flasher module is on the right side of the frame under the fuel tank......look back a little bit in the this Rubber Side Down page and you can find the discussion about it that occurred a few weeks ago.

I do hope you bought LED turn signals that are worth installing.  Most cheap LED turn signals you buy are not bright enough to be seen in traffic in daylight - they are not safe to use as motorists can't  see them flash in daylight or bright sun.

Got the headlight and turn signals working and everything put back together. I guess I am creating a little bobber out of this bike. All I really want to do is thin it out. I don't know why manufacturers make all their bikes so big and "puffy" (and heavy). I'm starting from the front and working toward the back (as I can afford it). Next will be a dished Wassell mid-tunnel fuel tank. The tank will also be red like the fender with white in the dish! should look nice with a red rear fender eventually.