If you're using BASH, open your ~/.bashrc file and look for the following lines:
# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
Uncomment the last line:
This will give you a colored prompt.
To change the default colors edit this line:
Use the codes from the previous poster.
You can set the default colors for the ls commands with the dircolors command. Other commands such as find have their own color options.
Hope this helps.