How do I create a small terrarium?

I have searched the Web and Amazon and would like more complete instructions. I am not a terribly good gardener and would like to know step by step how to set up a terrarium. The main requirement is that it be as nearly foolproof and easy to maintain as possible. The container will be small and will use direct sunlight from a window. The plants should be slow growing. Flowering plants would be nice but from what I have seen are probably not suited to a terrarium. I am thinking of using just two different plants. Please include a list of plants that can be grown together.