Before I recommend any particular brand or make, I would first advise that learning to use a tablet is going to take time and effort, and to really consider what your goals are.
If you lack confidence with a piece of paper and pencil or a brush and canvas, I would suggest dedicating some time to do that, perhaps scanning it in and working in vector based software like illustrator or flash if you want to make game assets.
Any tablet will take some getting used to, as you work on coordinating your hand movements to the screen, getting a feel for how the stylus moves over the smooth surface of the tablet, understanding the workflow of using painting or photo editing software to get the results you expect and learning the basics or good art can be overwhelming.
If you are still convinced this is the direction you ought to take, Wacom has been the industry standard for many years, but I've heard the Chinese make some decent alternatives these days, but I don't have any hands on experience with them.