Hi Denis,
sorry i can't help you i am not a rigger. i think you have seen the goldfarb tutorials? https://www.sidefx.com/learn/collections/rigging-series/
you also can ask on the houdini discord sometimes goldfarb is also online and answers questions.
what's also nice a new release of houdini should come out soon (i think this month). the character system should get a big update but i am not sure if this or next version. (mentioned in the end of the H18 presentation)