While God can and has used dreams to communicate with us, you must be careful in determining that it was God, and not your own conscience wanting the desired result. It can be hard to tell the difference.
We have a church here, and they just hear from God all the time. But when things don't turn out the way "God said they would", then it was either because there wasn't enough faith, or God changed His mind. So, just be careful.
Buttercup pinpointed the crucial element. Her dream gave her a glimpse of the future, and then she watched it play out in real time. She said that there were affirmations that came after the dream about her father, and that is a key factor. If God tells you He is going to do something, and then you watch Him do it, you know that you know that you know.
Jesus said, "My sheep know my voice." The more we listen, the more we will hear His voice and recognize it. It's funny how we pray and then hop up and go about our business without being silent and waiting for His answer...