Patch Arena has some SFZ format info here:
patcharena (dot) com/synth-resources/sfz-format-resources/
(helpful links at the bottom of this page include the original rgc:audio sfz page, maintained for posterity)
The following examples make use of the free Plogue sforzando SFZ 2.0 file player:
SFZ Tutorial Part 1: Hello World!
https://www.youtube.com/watch?v=bTFs524KrGc SFZ Tutorial Part 2: Generators , transpose and ADSR
https://www.youtube.com/watch?v=iWIRegt32o0