Choosing a Enclosure
The first thing you should buy when considering purchasing a veiled chameleon is the enclosure. Depending on the age of your chameleon, you will need a cage large or small enough to accommodate him.

You can either buy a pre-built enclosure or build one yourself, usually the cost is about the same so it's just depends on what type of enclosure you would enjoy.

Veiled chameleons are an arboreal species, and as such, they prefer vertical space to horizontal space. Adult veiled chameleons should be housed in enclosures with minimum dimensions of 24X24X36, but a larger enclosure is always preferable

Newly hatched chameleons are very small, and should be kept in enclosures small enough for the owner to keep a close eye on the health and activity of the reptile. A one to three month veiled chameleon can be housed in a standard 10 gallon glass aquarium, and this is the only exception to keeping chameleons in these type of enclosures, any older and they must be housed in a screened enclosure.

Juvenile chameleons can be housed in these large screen enclosure, but will often have trouble finding food in such a large enclosure, so most chameleon owners will just block off half of the enclosure.

Setting-Up the Enclosure
Once you purchase an enclosure, it's time to furnish it properly. Veiled chameleons are highly adapted to their arboreal lifestyle, and require climbing and basking branches. Branches should be slightly larger in diameter than the chameleons grip, this allows the animal to walk and perch comfortably. For baby chameleons, it can often be hard to find small enough branches, but most pet stores now sell bio-vines that vary in size for any age chameleon. Place these branches and vines inside the enclosure in a unique fashion to form little "chameleon highways". Try not to crowd the cage with too many branches and vines, but make sure the chameleon has enough branches for sleeping spots, basking spots, and eating perches. As the chameleon grows, gradually increase the diameter of the branches until the animal has reached it's full size.

Branches large enough for adult veiled chameleons can be gathered or purchased, but make sure to properly disinfect any wild branches. Connecting branches together can be a chore, but there is a simple fix that can relieve this problem. You can use zip-ties, but often it is to hard to cut the excess ribbon short enough to not scratch the chameleon, so finding something softer is better for the chameleon. You can use soft string to tie the branches to the screen and this is often one of the easiest fixes.

For the bottom of the enclosure, do NOT use any substrate (wood chips, sand, etc) because the chameleon can often ingest the substrate and can cause many health problems. Just use butchers paper or paper towels at the bottom, this makes for easy clean up. Make sure to replace the paper weekly and not to allow water to gather at the bottom.

Choosing Plants
Unlike other chameleons, Veiled chameleons are known for also consuming vegetable matter in their diet. One of the best and most visibly appealing ways to provide vegetation is to have a live plant in the enclosure. The most commonly used plants are Ficus, Potohos, and Schefflera. These can be purchased at most plant stores, and even places like Walmart and Home Depot. Try to get a good size plant for the center of the enclosure, this will provide "hiding places" for your chameleon which they love. Once you purchase a plant, you should re-pot the plant in sterilized plain soil, and also try to wash the roots with warm water to remove any pesticides and incests.