well since you are just a little too retarded to look at the guides section at the top of the forum, ill give you some suggestions. For assassins theses days we have kickers, WWers, trappers, and hybrids. I'm a big fan of claw/claw since they are able to block any attack including elemental and magic spells from casters, they also sustain there blocking% while running.
for ww, i say max, claw mastery, venom, fade, get claw block to 60+% and then if you dont have dragon flight from one of your claws put a point into it, mabye a point into wake of fire for stun lock purposes. For a kicker, max dragon tail,(i think thats the one with multiple kicks), anyways max venom, claw block to 60+%, and i like to max shadow master but this is up to you, again wake of fire for stun lock, dragon flight. hybrid, would be a ww sin also using traps, i do not have any experience with this build so i wont comment on it, but you will most liklley be using ww, and lightning sentry, claw mastery, light sent, synergy to it, venom, claw block