A length of bevel siding laid on the rough sill pitches it toward the exterior, and a 3/8-inch rip of scrap nailed along the interior edge makes the back dam — a draining sill pan built from offcuts.
Engineered truss screws (Simpson's truss/plate connector screws) drive at an angle through the plate into the truss with a guide that sets the angle — much faster than nailing off hurricane ties, and rated to meet or exceed the same uplift specs.