I'd go as minimal as possible to start with - probably just some ways to sequence and combine triggers - unity mixers, switched multiples* and gate/trigger combiners etc - and a trig31
get that working how you want and then consider adding a sound source
how are you mixing/listening?
*this is contentious - you shouldn't use multiples as mixers - bad, bad practice - it will work until it fries your expensive module - but if you only ever use your switched multiple for this purpose then it works
"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