To setup a live stream on Facebook, first navigate to the page you want to live stream on. Then navigate to publishing tools and then video library. Next to the upload button select “Live”. 
Next copy server address and streaming key and send it to the live streaming agency you are using for your event. Make sure to delete any white space at the beginning and end of each line.
Click next and wait for a video signal from the live encoder. When you receive this you can go live. Often times you want to plan an event, which you can do by clicking the drop down button next to “Go live”.