Got an old Atala 960'S or 70's) bike with 3 bolt crankset, Regina Corsa SICC 2 prong 5 speed freewheel on Super Iris wheel with the dimpled brake surface. I've read Sheldon's piece on conversion but still a bit confused. Particularly with the using the original rear hub part.

Not sure if this is the forum or I should go to the mechanics forum but will try here first.

Once the freewheel is removed (if at all possible), I can thread on a fixed sprocket. I have to adjust the existing spacers (on either side of the wheel on the axle?) to eyeball the chain line. Then re-dish the wheel.

The questions are:
Do I need to buy additional spacers and washers to supplement what's already on the wheel?
If more spacers are needed, what diameter should they be, do they go between the sprocket and the wheel or outside the sprocket?
Do I have to buy the fixed sprocket to thread on or it can be taken off the Regina freewheel or some other freewheel?
If the sprockets have to be purchased, does it matter whether it's left or right hand thread?
The English BB lock ring is the last thing before the dropouts?
Quick release can be used on the rear wheel?