There are some limits as to of what weapons that you can use, but really, it's pretty flexible. My only suggestion is to try out the weapon first where it's safe (non-combat) and try to stay with swords. It doesn't have to be a sword though, cause I have been able to backstab with the flail of ages (if you don't know what this is, you should find it in the De'Arnise keep). If you find the short sword of backstabbing (thieve's guild), it's awesome for this. The main thing that comes into play is what kinda armor that you have. If you have anything (item) that will help your stealth or Strength, that would help in the backstab. Especially Strength, because if you are stronger, you do more damage to begin with, and then it gets multiplied by your damage for backstabbing. Anything that helps with stealth will help you hide in shadows more often when you need to. As an example, if you backstab someone and can run behind an item that blocks your view, you can hide in shadows again and either walk away from the fight, or jump back in and backstab some more. It can be kinda frustrating to start off (that's why I pushed most of my points toward stealth when I started off), but this character will get very powerful at higher levels.
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