My personnal experience about servitors was using preexisting ones like jinns but for non moslems it's better to avoid them
So now Crowley's technic about servitors called "Moonchild" would be to trace a sigil on its ground to launch the sigil and then to bury it. All that must be done on quarter moon. When fulll moon arives get it out from the ground lauch it again and pure the semen on the ground like a libation.
I think you understood that you must exactly now for what purpose it is used, don't try to make it for too many purposes cause it may do nothing.
Other point, there are other chaoists ou there who work with god forms but I've never tried
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Beware i's quite dangerous like all the other stuff
Ciao