Take a look at the Sekonic manual for this over here:
The quick start manual for the 308 S over here:

And for an excellent uncomplicated education on how to use a light meter, check this out:
"The Hand Exposure Meter Book" by Martin Silverman, Jim Zuckerman and Bob Shell Published by the Photo Books Division of Mamiya America Corp. First Edition 1999. You can find it over here, among other places.
http://www.amazon.com/s/ref=nb_sb_no...20Meter%20Book The same basic info applies today as it did in 1999. Only the meters have changed (to protect the manufacturers. ;>)