single fin egg

i want to shape a single fin egg for my first board! but i have never surfed an egg and have no clue on the dimensions i should shape it. i am an intermiediate longboarder and a decent shortboarder. i am 5’9 125pounds. what length, width, thickness, nose and tail width should i shape it. i want it pretty thick because i surf slow waves and not extremely powerful waves. also i want it to be a retro egg. So my question is What lenght should i make it, what width, what thickness, what nose width, what tail width and what kind of tail?

thanks

Will