You need to have permission of your friend (the one you're casting it for) to make it work. It's best to do this on a waxing moon and on a Wednesday.
You will need: 1 Orange Taper Candle with holder, 1 White Taper Candle with holder. A Large Church candle with a green ribbon tied around it, A piece of opal, aquamarine or citrine, Symbol of Mercury (Hermes)
Put the taper candles beside the Church candle. Cast your circle. Hold the gemstone in your left hand and the symbol in your right hand and say:
"Hermes, give (friends name) answers in her sleep, And make them his/hers to keep, Give him/her guidance, clear and true, So he/she knows what to do, And it harm none so mote it be!"
Meditate about your friend making the right decision. Thank Mercury/Hermes and the elements. Close your circle. Don't forget to snuff your candles out, NOT blow them out!