https://youtu.be/uIkRjA4xF5A
Choosing your stance is a personal thing, finding out what works best for you is essential. The important thing is to have good stability, alignment and comfort for your stroke.
Your stance begins with the placement of your feet. Much like the story of Goldilocks and the Three bears, It’s important that you find a foot position thats not to far apart or to close together.
Once you’ve established your foot position the next task to incorporate is your center of gravity when bending down to the table. Be sure to place the same amount of weight on both of your feet. Now, place your bridge hand on the table and remember your bridge hand is not for support its meant to give you a sturdy base for your cue stroke.
Now, lightly grip your cue stick near the back approximately 5 inches back with your non dominant hand this should give your cue good balance point. Ideally, your arm should be at a 90 degree angle with your cue stick giving you a smooth stroke swing.
There are many types of bridge positions so if you are not familiar with a bridge you can check out some of the following links:
The Bridge
http://www.easypooltutor.com/articles/25-fundamentals-of-pool-and-billiards/20-the-bridge.html
How to Play Pool : How to Make a Pool Cue Bridge
https://www.youtube.com/watch?v=uIkRjA4xF5A