ECU codes - How to read

I tried searching to find the procedure for reading ECU codes and couldn't find anything.
My check engine light came on and I need to figure out how to count the flashes.
Do I turn the key on?
Do I start the engine?
Does more than one code display at a time? If yes, what is the interval between flashes to know when a new code is being started?

Your Assistance is Appreciated!!!

Brad

1.turn the key to the on position, but dont start it.
2. pull down carpet to look at led
3. count flashes, there is a pause between codes ( about 2-3 secs...not that long)
4. Looks up code for prob http://www.4thgenerationcivic.com/F.A.Q/F.A.Q..htm

I'd probably pull down carpet first before turning ignition on...hehe:D

Dont forget to put the ebrake on, and put it in nuetral. :D

be sure to count the flashes at least twice. it is possible to have multiple error codes