This is for swanstone solid surface, not their Veritek.
a - color matched caulk
b - very easy - 220 / finish wish 320
c - minimum 40 tooth - I use an 80 tooth carbide
d - I've always installed over greenboard with no problems.
just follow the instructions for prep.
e - other adhesive... order their installation kit and color matching caulk.
when I run out of their adhesive I use "Liquid Nail -tub and shower