I start the siphon with the tube full of star san method - works really well. This link is a good demo:
I realized I've changed a little from the method in the video. Here is my current method:
Sanitize cane, tube, and hands. Have the anti-sediment cup on the end of the racking cane. Attach tube to racking cane. Hold racking cane and tubing with the open ends up both together at the same elevation. Pour Star-San into end of tube, moving tube and cane as needed until cane and tube are completely filled, with no air bubbles. Put thumb over end of tube. Gently turn over the racking cane and lower it into the full bucket. Lower the end of the tube to a small pan. Take thumb off the end of the tube the siphon will start. Siphon the Star-San into the pan. When beer gets to the end, put thumb over the tube again. Move end of tube to bottling bucket. Remove thumb. Siphon will re-start.