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Quad vca can act as 4 channel mixer, but more importantly, a way to modulate your voices (or cv or anything else run thru it)...try patching 1st row "voice" into one channel and modulate with envelope generator or cv like lfos, etc to get a feel for basic operation...

if you're asking for such help, that's cool, but it would tell me you need to better master basics before expanding with more modules or a keyboard, etc.
Get a hang of 2 sequencers already in rack and the rest of it before adding more complexity, imho.

Best of luck!!