Waywatcher is a good hero, but the Nomad Prince tends to make a better general with his command ability when I have played them. Try both if you can and see which one works better for you.
Eternal guard are really hard to dislodge once they get in cover. Especially if you throw a shield on them. Also fun to throw the Sisters of thorn unique spell on them as well.
I haven't played with Waywatchers as a unit, but if your opponent is Chaos bring the Sisters of the Watch out.
On escalation I would probably bring out your Glade Guard 1st and shoot and move a bunch. And hopefully trying to alpha something with that -3 rend. Then Eternal along with Waywatcher. Finally your wild riders and great eagle last to pick off objectives.
Those are my thoughts, I really enjoyed them as a army, although I'm playing all trees right now