I'd encourage you to spend a few more days researching tony. Welcome to the boards, this is one of thebest places to research!
Aquariaums/terrariums are great for many reptiles including some species of chameleon like pygmies. However it's less then ideal for a veiled chameleon. Veiled's as most chameleons need vertical space, plus horizontal airflow.
A veiled in a fish tank has very decreased chance of survival. Even if the lid is screened. The whole cage should be screen. LLL Reptile sells some great cham cages, but so do some of the sponsors on this forum.
This is just the starting point.
You should look into misting, how will you achieve a regular misting schedule?
How will you provide drainage? It is suggested that you don't use substrate because of risk of comsumption and compaction. i wouldnt use substrate because of this
What kind of lighting are you going to use? one heat lamp and a large uvb light (i still have the lights from the pygmys)
What will be your vit and mineral supplimentation schedule? preferably twice a week with repcal
What will be your feeder rotation? Do you know how much they eat and how much that will cost you a month in feeders? i would feed mostly 1/4 in crickets with ocasional wax and silk worms.
I highly recommend you don't buy a female. A female will lay eggs and you will need to recognize the signs when she's ready to dig to lay a clutch (fertile or not) you'll need to provide her with a temporary place to dig. thats also a reason i was leery on buying a female. males just grow too large which as you can see is the main problem
As you can see there are many issue, maybe you know the answers to most of these, but if you don't you'll find them here on this forum. Please use the search tool whenever you can, you'll find mountains of info.
Welcome to the boards tony! This is one of the best forums I've ever been to.