Everyone has auras, it will have different colors and symbols in it according to what is going on in a person's life.
Some people who are visual will see the aura and some can see the things that are symbolic.  I have a friend who can see crutches, if the person had a hurt leg, money, flowers, all sorts of things in a person's aura.
Others feel the aura. It is best to start away from the persons body.  Get centered then with your palms toward the body, start slowly moving toward the person.  You feel a resistance, or feel something like some material.  It can have temperature also.  There is the etheric part of the aura, the mental, the feeling.  Many more layers.
The aura is a bit sticky, so it can pick up stuff on the outside.  There are various techniques some use for keeping it clean.  The wind can clean an aura. It changes size according to how people feel.  When scared it can move close to the body, or, way out to try to keep people away.  When happy the aura can be light and fluffy.  Sometimes it is like cotton candy, other times it is smooth like a silver ball.
It is all around us much like an egg in shape.  
It is what people move around in and as long as a person is alive, they have an aura.  
I feel them.  
Some can hear the aura,
others see them.
Hope that helps.

And remember, you may not find how you can best see/feel etc. the aura through the book you have, as there are many different techniques.  Expierment, find what works best for you.  

When I first started "seeing" auras, I did it with my physical eyes closed, leaving my other senses to pick it up and then that allowed me to "see" it.  Practice made it so that I can see some of the aura now w/o closing my eyes  Expierment and practice  And much love your way, I hope you can find what works best for you!

That's absolutely correct Bandit81101.
My friend who sees auras says he does it the same way he sees those pictures that are all dots.  You have to unfocus on the picture and let your self see the image in an unfocused way.  Often those pictures have a place for you put your attention and then the eyes can see the image in the confusion of dots and colors.
I bet this does not make sense.  

I have tried some techniques before but really no luck. I believe the concept of auras and chakras the first time i read abt it. Years later they develop this aura machine now very popular in crystals shop I had a chance to experiment with it.

As tourbi has said I also read about the aura from the camera is not the same as what psychics perceived it to be but the the colour of the aura is the same. I use to experiment with customers to change their aura colour....

That's a great talent/gift you got there Bandit81101 and tourbi

It does make sense  Reminds me of those pictures the eye doctor shows me that have 2 different color dots and one of the dots forms to read a number and I have to tell him what the number is lol  Like an optical illusion