Action Details
Requirements and how-to articles for Facebook's action:

Facebook Live allows you to stream live video footage from your camera, screen or a game.

You need this to get it done:

Video Feed
A live video feed from one of the input sources listed above (streaming software/webcam/etc) that you wish to broadcast.
Recommended maximum bit rate: 4000Kbps (4 mbps)
Maximum video resolution: 720p (1280 x 720 pixels) at 30 frames per second
Video encoding: h.264
Audio encoding: .aac
An I-frame (keyframe) must be sent at least every 2 seconds throughout the stream.
A description for your broadcast. Here you can go into more detail about what you are streaming and include any relevant links/hashtags.
Title (optional)
A title for your broadcast. Try and keep it short (maximum of 255 characters) but with enough information to let people know what your broadcast is about. (e.g. "[Game/Application Title] Development Update - May 2019")
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

About Facebook Live
Information and FAQs regarding Facebook Live.
Facebook - Create Live Stream
Get started live streaming.
Facebook Help Centre - How do I go live on Facebook using streaming software?
Step-by-step guide on how to go live using streaming software.
Link missing here or found errors? Improve How-Tos