1) Why do we add salt to the ice?
To make it lower freezing point.
2) Why do we add the cookies and other things, only after the milk has frozen slightly
Because it will not too stick in ice cream.
3) What are two factors that affect the freezing you think?
Ice and salt make it cool and freeze.
4) Why do you need a bit of air in the bag?
So it will be easier to make ice cream.