I'm not really sure but I know you put the ingredients in and the ice and salt goes around it. Then it makes it cold and creamy. You don't make the cream, you buy it at your grocery store. Look for...
Cream is obtained by letting whole, fresh milk stand until the cream or fat, rises to the top. The cream is skimmed off and reserved. The remaining fat-free liquid is skim milk. To make whipped...
Yes. Either whip it in a mixer or use a wire whip. Using an electric mixer is the easiest way to do it. But be careful not to overwhip or you will end up with butter and whey.
I believe you cant... That is why it is called ice "cream". You can only make a healthy one but milk would be needed so therefore you would need cream.