Thanks - I try to help!
a good place to start:
mutable links, kinks, shades (or any other modules that cover their functionality) - multiples of this (or parts of it) are extremely useful - either as identical modules or different ones
a matrix mixer - one of the most powerful tools in the modular synthesist's toolbox - use them for combining modulation sources, setting up feedback loops, adding send return functionality to mixers without it etc etc etc
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities