The most practical way of approaching this would be to listen to other music, determine the mood, and look at what chords or progressions were used to create that feel. It won't take long before you find stuff that is similar to the mood you're looking to create. While we all want our songs to be personal and unique, the same compositional elements get used over and over again, because they do the job so well. I'm a strong believer in the advice attributed to Igor Stravisky. "Good composers borrow, great composers steal." Since you determine what you steal, it is still very personal and unique, because it was your choices.