Every bike is a little different. But first you have ot set the sag. Then adjust dampeneing ot your prefrence, starting at stock settings.
TO set sag. Youi typically want 30-40mm or sag. Sag is the difference in how much your shocks compress from fully unloded to when your sitting on the biek.
First unload the frotn forks, you may need a person to lift them or use a front stand. Measure from a fixed point like the triple clamps too the ground. Then sit on the bike as you would when riding through a turn (leaned forward). Measuer this number from the same point as before. Subtract the meausrements. If it's aroudn 40mm, your good. If it's higher, add more preload, if it's less, reduce the preload.
Do the same thig for the rear.
Typically the rear is set very stiff at sotck settings since the bike is designed fro a passenger, and the front is a little soft.
I'm 180lbs, I'm at stock preload in the rear and 1 line more than stock in the front. That was for BHF, I'll run a little more preload for Gratton.
For dampening, you want ot run as little dampening as needed to keep the bike from floating around.