Replying to my slave makes rails

hell yeh. my dads friends buisness is slow and he can make me a rail. they call him mike the welder and hes like pro welding duder. all he wants is a nice schematic drawing to show him. now for YOUR help. i have never grinded in my life, not once. i can hit rails all day long on my snowboard but i have never went to the park on skis.

so what should i do? obviously a strait rail, but do i get a double rail for easier slidage? how long? how high? do i have it touch the ground or make it off the ground with a launch ramp? o, and this rail will be in my backyard so speed is key and what not.

im not asking for a drawing, just advice. but if you give me a kickass drawing, ill give you something kickass in return.