So i''m trying out WOW. I keep dying because I can't fight..

I have a human character with a sword. When I target an enemy I keep clicking the right button while aiming at the target, but the character only hits like once or twice (even though I'm clicking frantically) while the enemy keeps on attacking.
So that's how I get killed all the time, and it frustrtes me to no end.
Anyone know what I'm doing wrong?