[header] How to build a vivarium [title] Decide what animals and plants you want to keep. [substeps] Determine if their basic requirements make them incompatible (such as high humidity frogs and low humidity cacti). [title] Purchase a suitable sized aquarium or terrarium, remember animals like to move around and plants need room to grow. 
[substeps] An aquarium is basically a glass box that is only open at the top. Terrariums usually have hinged or sliding glass doors on one of the vertical sides to make access easier.