Good morning Roger
As you will be using your new rod for saltwater applications,
I would suggest the following,
the 60, 20, 20 Rule.
60 percent of the leader length being the butt section, and the final 20 percent being the tippet section.
For and 8w, myself, I would use 50 pound mono for the butt, then 30, then 20 with a short bite tippet added to this overal lenght.
Length, this wil depend on the wind strength and direction, eg into your face of side on.
In to your face breeze, overal length is decreased to around 6 to 8 feet depending on the flies size and bulk.
In your face, a double tapered leader can be of an advantage, eg, 50, 20 and then 50 again, again on the 60, 20, 20 rule.
With the breeze from behind you a longer leader can also be an advantage and can increase the cast distance.
Trust I have helped and not confused,