You need to select AD 1.1 'Aerodrome/ Heliport Availability'- the minima page is a subsection of this (AD1.1.2). It's listed on the index to say where it is but the page design doesn't seem to be clever enough to take you to subsections...
SDF and other definitions can be found in GEN 2.2 - SDF is indeed Step Down Fix (Page Gen 2.2.8)