There are many examples in scripture that tell us that God's people used the casting of lots to receive desicions from Yahweh. I think this is a valid means to discover truth or at least the will of God.
Proverbs 16:33 "The lot is cast into the lap; but the whole disposing thereof is of YHVH."
Most examples of casting lots are in the old scriptures. All the land of Israel was divided among the tribes by the casting of lots. The solders who divided Christ clothing cast lots for it. Even the apostles used the casting of lots to see who would replace Judas as one of the twelve.
I have two friends who have cast lots. One has done it quite frequently. The method used was to throw a coin to the ground twice having decided which side is yes and no. I have just taken the common heads are yes and tails no.
The key is to pray and be very thoughtful of the proper form to ask the question. I would advise writing it down as I have tended to forget the exact wording used although I remember the outcome. I say this because sometimes after two throws one might get a mixed answer. I take this as a no answer or a poorly worded question. One time I asked and got a definate answer. Then my second question was a no answer. So I rephrased the second question and got a definate answer. The one question I aksed that I will mention was, "Is the scripture complete as we have it today?" The answer I received was a definite no.
Search types I used were lot*, by lot*, cast* lot* and the lot*. Of course one would do well to remove the name of "Lot" by using a case sensitive search.