yeah my bow is my main weapons of choice. i use my skill points on bow expertise whenver i can. i also just put one on elemental arrows, and it kicks butt. it does 40+50 elemental damage WITH my regular bow damage which is 20-120. this in only the first level and it uses only 1 mana point. for stats i mainly keep my agility and strength to a 2:1 ratio respectively. right now im like a lv 18, stats are 40,85,10,10. also invest in lockpicks, ranger sight, etc.. the essesntials i guess.
i don't use sneaking at all cuz i don't know exactly how to use it effectively. anyways, for backstabbing it only does double the damage, with increases to the skill only increasing the percentage of actually doing backstab. im at 1 skill point at backstab and in the very first parts of the game, i used a dagger which had backstab ability and attacked normally, it would every so often so up as backstab damage along with the damage points.