what do to on striking the left key mouse my hero has attacked?

Not sure what you are asking here. Could you explain better what exactly you want to do?

I'm not sure if this is what you ask for, but if you want your hero to attack(swing) when you press your mouse key, you can play an animation of him punching (it might be in the anim folder) and make it call a function when it hits something.

Well what you can do is take the animation tutorial.. and add the function inside a if statement with a button action.

e.g snippet:
if(Ms.bp(0)))
{
playAnimation("attack1");
}

thanks