ive never played a melee build, can some1 tell me about auto attacks..

[leafdale]

i was wondering, if i play say a barb, do i have to click my mouse button for every attack?

or if u hold it down, will it just keep repeat swinging with say my sword?

or will i only swing if an enemy is in range?

or if i enter combat mode, will i just keep swinging around even if i dont click the mouse button or something?