{NOTE: There are many different kinds of terrariums you can create, each with it's own specific climate. I chose a northwest themed terrarium: for low light/shade and light watering needs.}
Terrariums need a bed that will collect and reserve water inside the container without causing water build up and rotting roots. You can use charcoal, rocks, moss and sand for this.
2) Soil:
A fresh, healthy topsoil will be best to plant your plants into. Make sure that the soil is packed firmly on top of your bedding choice. Soil will settle with time and you want your plants to be secured.
3) Plants:
Choose a variety of plants to fill your terrarium. Many different styles of plants placed tightly together look very unique and intriguing. Make sure your plants vary in height and color as well.
4) Accessorize:
Using crystals, stones, sticks, statues or figurines is a great way to polish off your terrarium. It adds individuality and expression to your space.

