I think I have the following list right, correct me if I am wrong:
Box comes with:
24 Glade Guard
8 Glade Riders
12 Dryads
Unfortunatly the batalion box units don't come in sizes that players typically use, but we will see what we can do.
Dryads usually are fielded in units of 8, but this is a special case cause we want to get as much stuff on the table for you, so field all 12 of them and give them a champ
Glade riders are a little tricky, they usually get fielded in units of 5 with a musician, but again we want to get as much out of the box as possible. You could field all 8 of them in a unit since there isnt enough for two units. Definatly give them a musician and even though in a regular points game a champion is not worth the points, in this case you might consider taking it for the extra 1BS on the champ. Even though its not usually done, I would reccomend taking a standard on your glade riders, but be careful only to get flank charges off. The only time you should be charging with your glade riders is to support your dryads in the flank, or maybe to hit a warmachine crew. Just be careful because the extra 100vps from a lost banner can make or break games at such a small point value.
Onto the glade guard. Usually we field them in units of 10 and a musician can be alright but not nessisary if you wish to spend the points elsewhere. You can probably get away with fielding 2 units of 12, but they may be hard to manouver if you put them all in a 12 long single rank line. If you had one more guard I would reccomend 2 units of 10 and one unit of 5 scouts but unfortunatly we don't have that one extra elf. Hopefully you will get a hill in your deployment zone and then you can rank them 6x2 and shoot them out. As for unit upgrades, give both units a musician. Usually we dont upgrade to a champion, but in this case, as with the glade riders, since points don't really matter, the extra ballistic skill could help. I would not take a standard because glade guard are terrible in close combat. They need to shoot things down before they get to them. Fleeing is probably a better option of standing and shooting, unless you have a good chance of causing a panic test or if you don't think you can out run them (watch out for cavalry).
As for the armies you will be facing, bretonians I am not too familiar with their batalion box, but I think it will contain some knights of some sort, watch out for them, they will be hard to beat in close combat due to their high armor saves, but a charge with dryads supported by glade guard in the flank may be able to take out enough to break them (especially if you then outnumber them with your fear causing dryads). The knights aren't fast cavalry like the glade riders, so you can run circles around them shooting and marchblocking them for a little while if you like.
As for the warriors of chaos, they will have warhounds, marauders, chaos knights and chaos warriors. first thing to do is shoot down the warhounds and marauders and they are squishy. Your dryads can easily take marauders and warhounds in combat. For the warriors, if you get dryads to charge them in the front will probably not be enough to win combat, so you might need a supporting flank charge from your glade riders. As for the knights, my only suggestion is to shoot them down and try not to get into combat with them. Bait them into charging your glade riders, but dryads will not do well in combat with them, as their attacks will bounce off 1+ armor saves, and the knights have magical attacks so you won't get a ward save. Also pay close attention to how each unit is marked. If he has alot of nurgle units it will be bad for you (-1 BS to shoot at them). If he has mark of khorne units, you can bait them into charging your glade riders at akward angles and then fleeing using the feigned flight rule.
On the whole, your general strategy should be to shoot down as much as possible before you engage the enemy. Get accross the board with your glade riders to march block and to bait the enemy into charge/flee traps with your glade riders. Since you only have 2 potential combat units it will be important to use them together as often as possible. The two key things to do to ensure your wins; Out manouver and out shoot. It might be a good strategy to take out their weak units and then play a points denial game just keeping your units alive an capturing board quarters.
So the list would be
12 Dryads + champ - 156
8 Glade Riders + champ + music + standard - 228
12 Glade Guard +champ + music - 156
12 Glade Guard +champ + music - 156
total = 696
and a typical WoC for this type of tourny list will look like for a comparison
12 Chaos Warriors - full command, magic banner, a mark, shields = 277
20 Chaos Marauders - full command, a mark, light armor and shields = 170
5 Chaos Warhounds poison attacks, scaley skin = 50
5 Chaos Warhounds poison attacks, scaley skin = 50
5 Chaos Knights - full command, magic banner, a mark = 305
total = 852
as you can see you will be outnumbered (which is why this tourny set up is a neat idea but should have a points limit to make things fair)