Fin Size, What size should I make ?

Hi Guys

I’m completely new to this and have just shaped my first board. I’ve done lot’s of reading AND searching on here. I really need some help with a size and maybe template advice for my board. I’ve shaped a 6’3" fish with a flat rocker and nice nose and tail width. I need a board that will work in fat waves up to shoulder high. Speed is the name of the game I’m not capable of big turns and just want to be able to carve and have fun. I’m going for a quad set up but don’t know what size fins I should use. Can anyone point me in the right direction??? Any help would be greatly appreciated. Cheers