Where can I find the other Channel Divinity options for Clerics that are hinted at in the PHB?

For a Cleric, the PHB shows two Channel Divinity powers: Turn Undead and Divine Fortune.

However, it says there are other Channel Divinity powers, but I can’t find out what these are.

What are those other options and where can I find them? Are these (and the previously mentioned ones) available to a first level character?