Carla Schwartz and crew of CB99videos on YouTube have produced a complete and concise tutorial for using NewTek TriCaster® to stream live to YouTube. The tutorial specifically goes through the steps to create a YouTube Live event. Some of the steps to stream to YouTube need to be done on the TriCaster system, but many of the steps involved in setup on the YouTube side can be done from any available system. Using another system for those steps frees the TriCaster to prepare for, initiate, and deliver the live stream.
Very important tip / warning about streaming static graphics. We lost our YouTube live streaming privileges for over a month because we streamed a static graphic during a test. Do NOT stream static graphics! From NewTek