I'm under 18, by the way.
Very well, that's important. Well, as you are under 18, the minimum hour requirement would be 50 hours of supervised practice driving.
Wow, that much, huh?. Well, thanks. Oh, please, could you tell if i would need to have a pre-licensing certificate in case i need to change my license class sometime?
That would be a no. If you are in possesion of an valid NY State driver license, you don't need to own a pre-licensing course certificate in order to change form one class to another. Just go with your valid NY State license and apply to amend it to another class.