Well , most people take fire since it is the most damaging imbue among all 3,Cold,Light and Fire.
I can give some pros and cons about the forces but i don't know how the bow build will be at 90 cap since i also ain't high lvl.
Cold:
Pros:
Can give Frostbite to slow ur enemy down and can give freeze wich freezes the enemy for a set amount of time.
Cons:
Lowest dealing imbue among other imbues.
Light:
Pros:
Can decrease the parry ratio of your enemy to make urself /others deal more damage to the enemy.Has AoE.(Area off effect, that will make mobs aggresive)
Cons:
Actually none imo.
Fire:
Pros:
Highest damage of all imbues. Gives DoT(Damage over Time).
Cons:
Actually none imo.
sadly enough i could not find a good guide so look urself :
viewtopic.php?t=19902And the other answer on your question:
PvE= Player Versus Enviroment else said Player Versus Mobs.