The EWF stand for the Empire of Wyrms Friends, which is an empire of humans that aspire to become one with the cosmic dragon through learning draconic mysticism.
Lesson One: Dragons.
Dragons in Glorantha are mystical beings of Immense Power - more akin to gods on a power level than a D&D dragon. They are cosmic beings and rarely interact with the world. When they sleep, sometimes their dreams are so powerful that they take physical form, and sometimes their dreams dream of doing things wise and cosmic dragons are far to deep for - like looting and pillaging and hoarding treasure. These are called dream dragons, and are analogous to D&D dragons, and would have statistics like the dragons in the RQ book or SRD.
Lesson Two: Dragonewts
Dragonewts are a kind of immature dragon. They are reincarnated over and over into new bodies and progress through the stages in RQ Monsters as their soul evolves. Ultimately they can ascend to true dragon status.
Lesson Three: The EWF
Dragonewts speak Auld Wyrmish. For some reason, the Inhuman King (head dragonewt guy) of Dragon Pass teaches Auld Wyrmish and the Draconic Mysticism to a Human, and the EWF is born. The EWF is built on converting people to the Draconic Way. It is a religeous pyramid scheme of sorts, and it's ultimate goal is to transform a huge part of Glorantha into a great dragon of which all of their souls will be a part. They of course need to control this part of Glorantha that is intended to be transformed into a dragon, and while changing a huge part of the world into a dragon seems like a good idea to the faithful, it is not so well received by those who don't buy into the plan - particularly those who like live in the areas to be converted.
Cool Factoid One:
As humans master or convert to the draconic way they take on draconic features, such as scaly skin, or forked tongues, or lizard eyes, or the like.
Cool Factoid Two:
The God Learners who can basically invade and manipulate and study the God Plane (and spirit plane) at will are completely unable to 'see' how draconic mysticism works.
This is of course a very fast and dirty primer, but hopefully conveys the essence of the EWF adequately.