Hey there!
I'm quite new too in the modular world too, but if you want to use your effects pedal you need an attenuator and an amplifier, to reduce the signal from the modular and then to re-amp it from the pedals, there are thousands of different modules and some of them are made especially for using guitars pedals (es. Malekko SND\RTN).

Hope it's clear enough and it will help you!