I am aiming for a MJ license because I'm into motorcyles, does the 50 hours of supervised practice applies to MJ as well?
Pretty much the same. You must have a minimum of 50 hours of supervised pratice driving, and that includes at least 15 hours after sunset. So driving 15 hours at night is important.
Thanks!!! That's really helpful. BTW, if I want to change my license from one class to another, would I need a  Pre-Licensing Course Certificate?
No, you don't need a Pre-Licensing Course Certificate or a SCC, you can apply for changing your license class with just a Valid NY state driver license.