There are a few things you need to consider before purchasing a reptile, or any pet for that matter. Here are just a few things:
1. Habitat.
What type of habitat does your reptile need, both when it's a baby and an adult. Baby Iguanas can start out in a large aquarium but when they begin to grow they need to be moved into something that is approx. 6' by 6' by 6'.
2. Food.
Some reptiles can survive off of small feedings once or twice per week, while others require daily feedings. Snakes will eat appropriately sized mice once or twice a week, however, turtles need greens, veggies, protein, and a small amount of pellets regularly.
3. Vet Care.
Reptiles are animals and with that are not able to care for themselves if they get sick. As a reptile owner it's your responsibility to take your animal to the vet if it is showing signs of sickness or distress. Things to consider with the vet, your bill will include your visit, medication, x-rays, or whatever your vet deems necessary to bill for.
4.Temperment.
Is your reptile docile or "wild"? A corn snake maybe a better choice for a new reptile enthusiast, because it's known to be docile. On the other hand a baby iguana isn't the choice for an inexperienced herp keeper, because they're are known to be "wild". They will scratch, tail whip, and my even bite to get away from their owner. Keep in mind, with regular handling, they do calm down.