I am 15 and going snowboarding for the first time this winter.?

i need help with what board size i should get and what kind of style im looking to get a snowboard even tho its my first time because i ahve been skateboarding for 4years i belive i will enjoy snowboarding i want to do everything going down mountains and go to a park so i was wondering what type of board i should get and what are the necessity like besides a jacket and pants i need thank you(ive been looking at nitro and K2 packages) i am 5 foot ten about 130 pounds size 9.5 to a ten shoe i ride goofy on a skateboard