i know some are hermaphadites but that doesn't help much i would like to know the whole proccess

Usally haveing 2 snails in the Aquarium,i think they can
change there sexes.So if one is a male and the other is a male
on of them can become female.

female snails can store active sperm for many months and weeks
so when ever she wants or is ready to lay eggs she will.
and you can expect baby snails any time

The female usally deposits the eggs out of the water i think.
( it depends on the kind i think aswell)

Any way i hope this helps alittle

Apple snails actually mate. I really don't know about all the snails, but I know for sure that apple snails mate.

The actually 'do it' and then the female lays the eggs above the surface of the water. The eggs then hatch and, voila!, you have baby snails.