Cutting materials are essential and daily business if you make miniature terrain. Here is a list of basic tools that make cutting life easier. This links lead to amazon and help to keep the terrain train rolling.
Materials like foam core, balsa wood and clay. These things are modelling essentials and allow you to make all kind of cool terrain features.
Foliage, Moss, Fine Turf and Model Trees. Here are some recommendations to make your terrain models greener.