The most important thing to remember is that the larger your habitat is the better off the little guy will be. I would use a habitat at least 30 inches long and 12 inches wide for a hatchling. This set up could be used for more than one as the size is mostly being used for gradient effects. If you do have more than one hatchling remember that they may not always get along and they will outgrow this habitat sooner than you might think. The reasons for the size are mostly gradient related.
All animals do better if they can control the temperatures and conditions that they are living at.
If you set up a habitat of this size and follow my suggestions the hatchling will have that control. Under the front right third of the habitat I install a sub - tank heater. Your hatchling will need to attain these temperatures in order to digest his food effectively. Place this fixture so as to supply the most intense light over the front third of the habitat. What you have now produced is a light and heat gradient over the entire habitat - the brightest and hottest area is in the right front corner.