Join Date: Jan 2009
Location: Worcestershire, UK
Well you should start with a solid base: glade guard and dryads are almost universal favourites as they are both pretty cheap and effective for what they do.
Next you want to add in some good offense, which pretty much means treemen and/or treekin but can also mean very big units of eternal guard or, if you're feeling particularly tricksy, wardancers. After that you really want a couple of eagles: many people can't use them effectively but if you can they are godsends (war machine hunters, blockers, redirectors or flank charging in support of others or to lose, break and try to get the opponent to chase after you).
Units I suggest you avoid are glade riders (just don't do enough for their points), wardancers (excellent unit, but I suggest you get some experience first), warhawk riders (expensive and not great, but you may find you want to include them later) and wild riders (decent enough, but not really needed).