Depends on how you usually communicate with spirits. I like to use shamanic journeying to meet them in their spaces, you can use pendulums, taro cards, developer clairsenses to hear them, use clairsentience to have the ideas come to you like memories.
We have a few tutorials on developing the astral or psychic senses that might be interesting.
You want something, or what happens is people come to this forum and go “oh I bought a servitor, can someone scan me to see if it worked”, and that’s not a fun position to be in.