i was thinking eather assassination or sutelty but i dunno what to choose

if you want to survive multimob fights go with combat. I am curently that and love it. I have 3 points in imp stealth and the rest in combat. It is up to you. ZTry one out and if you don't like it respecc. I started out assas. but was bored with it.

well you get 20 talent points so i suggest
8/7/5
well that for non daggers
or for daggers
8/0/12
for increased backstab and increased ambush crit chances ( both by  30%)