Neither Sanctuary nor Wall of Reflection protect from ANY AoE. Regular projectiles only. It’s also important to remember that Retaliation (which is a byproduct of many abilities, combos and traits, there is no specific Retaliation skill) does not really protect you from anything, it simply damages enemies for certain amount (depending on your Power) every time they damage you. You still get the full damage though.
Protection (which is different from Retaliation and Reflection, so Sanctuary has nothing to do with Protection, it’s about reflection), on the other hand, will protect you against direct hits and AoE by reducing the damage by 33%. It doesn’t protect against conditions though.
You can also just gear for Vitality/Toughness and run into melee (preferably using hammer #1 and #2 to proc Retaliation), but bring immobilize/stun removal. You’ll probably die a lot doing this.
You will CERTAINLY die a lot doing this. :)
To start, I would recommend going with Scepter/Focus and Staff.
Staff is to get you speed buff when running back to or away from the fight, plus mid range very wide AoE on autoattack, plus the might buff on “4” plus the “2” can hit a lot of enemies if you line it up properly. And it’s always fun to use the “5” on enemies that are trying to get somewhere (like into the keep you are sieging).
Scepter is to use most of the time. Its “1” is slow but can hit pretty hard especially at close/mid range or when shooting into a bunch of enemies. Its “2” is invaluable because it’s a ground targeted long range AoE, usefull from the wall, against the wall, everywhere. Its “3” is immobilizer and that’s always useful. Focus provides “4” which is a bit of a heal and a blind and “5” which is a 3-hit block, it will save your life numerous times. Focus is a very defensive offhand.
From the utilities skills, I would recommend getting Wall of Reflection, Save Yourselves and Hold the Line. Be ready to switch out Hold the Line for Retreat, you can do it any time you are out of combat, just click the arrow at the top of the skill slot. You might also want to consider Purging Flames for this slot if you get a lot of conditions (and you will :)). It’s a nice simple set of skills that are useful both to the group or to your selfish self when needed. :)
The above is probably the best set to start WvWing - it’s ranged, it’s simple, it provides a lot of survivability, mobility and support. Once you get comfortable with WvW, you can start trying more complicated stuff like Hammer, which is a very effective CC weapon.
[edit] Oh, and if using Scepter, for its “2”, consider the 10 point Vitality major trait that increases the size of symbols. And the 20 trait that makes symbols heal people. Well, these two traits are useful with most weapons. Plus rememebr that you can switch major traits without respecing any time you are out of combat.