Here's some good info on potty training and more can be found at the link below:
http://blogs.goddardsystems.com/Cedar-Park-TX/2009/09/22/...
Excerpt from Me, Myself and I
At first, it probably appears to the child that it is the toilet that’s being trained (hence the misnomer “toilet training”). After all, she is typically reasonably satisfied to fill her diaper and continue on about her business. It is parents who are so enthusiastic for her to move on to the pot in support of public health.
The transition need not be Armageddon if parents remember that a body is more ready for the mind to influence its conduct when development has prepared both. Consequently, toilet training takes less time and energy when your toddler is as ready as you are. Starting too early pretty much guarantees the process will be long and messy. Many children who begin training before 18 months are not completely trained by age four, while those started around two usually are completely trained by age three.
Timing: Somewhere between 18 and 36 months, the child will start to notice that her dirty diaper has become a bother. She may pull at her diaper or crotch while, or just before, she empties her bladder. She’ll pick a favorite corner of a room or go under a table before she quietly moves her bowels into her diaper. These are critical signs that she is making the necessary mental connection between bodily sensations and the urine or stool that is produced from them. It is easier if this behavior follows the easing of the extreme negativism of early toddlerhood. Bowel training is typically the first goal.
What Helps: Put a potty in the corner of her room and let her sit on it fully clothed at first, then without a diaper, a few times a day. Tell her how big people go poop and pee and let her watch a grownup using the toilet. (Stick to same sex demonstrators. Otherwise, you will create needless confusion at this age.) Tell her the potty is where she will put her poop when she is ready. Then, she can wear “big girl” pants and leave her diapers for babies. Let her play with her potty using dolls, water, whatever – the less mystery the better.