its 100 percent normal...
if you do it slow enough the car will start to roll and you wont stall out.
what he said
when the engine is cold, your car will idle at about 1k rpm, (when warm it will idle more around 750rpm).
when your clutch is pressed down, you are obviously in neutral (no matter what "gear" your shifter is in--duh). so your engine will go into its idle rpm settings. slipping the clutch very slowly will allow the clutch to spin first gear slowly because your tranny is still spinning.