Meditation with Intention. That’s it. Ask the question, to nobody in particular, and then sit quietly in trance and let what comes, come. “Ask and you shall receive” is not just for Christians. 
It helps if you already have any experience with shamanic journeying, guided meditation or astral travel, which are all pretty much the same thing. But mostly you need to let the impulses come and not judge them or try to analyze them, the conscious mind wants control so it gets in the way and is always wrong, just write whatever comes down and think about it later.
Check out the Core Shamanism tutorial if this is totally new, new, otherwise you already know how to do this if you let yourself: Core Shamanism Tutorial