I think you've got the right idea! If you buy one more box of dryads, you'll be able to run them as 3 units of 8, which will be perfect to back up your glade guard
I'd use the warhawk rider as a noble on eagle! I wish I had one
You could also use the waywatcher lord as a noble if needed, and the hero as a mage (you'll need one for some magic defense, and to cast some treesinging).
This looks like a great group of core wood elves, with some good models to use as heroes. You can definitely get some games in with just this, but I'd get the one box of dryads soon as they'll really complement your glade guard.
You probably won't be able to use all of your glade guard, since they need to be strung out 10-wide to all fire (unless they're on a hill). A good tactic people use is either taking advantage of their range and sitting back, or moving them forward to get
str 4 shots at close range! Then they can flee away from charges, and let your dryads either receive a charge, or counter-charge
I defintely think these will be a nice switch from dwarves! They should play totally different!