This is an example of How to visualize the open Chakras. The actual points are on the spine, but i attached the colors to the area of the internal organs so you can see what goes where. I hope this makes some sense. When you meditate you should practice feeling and seeing these chakras open from top to bottom all at the same time. Note the strand of white going up above the head. It is important to visualize white energy flowing into the first chakra down this thread from the sky.
 
 
 
 
 
 
 
 
This is an example of the seven chakras along the spine opened/used in visualization  for casting. They are opened from top to bottom the colors are associated with the internal organst as listed: white/just above head, blue/throat, gold/heart, orange/stomach, silver/ coccyx, pink/genitals, green/feet/ground. above the top chakra should be a crown rotating clockwise, and below the bottom chakra should be a black cube rotating counter clockwise. There also is a thin silken thread that runs from the top chakra to the heavens. This is where you recieve energy. Practice so you can visualize all these things happening at once. Once you reach this point you will be able to work it into casting.