Yep, each hole is two notes, blow out (blow) breathe in (draw). Don't know of any harmonica sites (never really looked for one). Maybe some blues site may have something ( also check "harp" ). There should be some lesson somewhere on the tongue- block technique ( I learned that from the little "instruction" sheet that came with my Marine band in "C"). though the proper breathing techniques ( blow , blow ,draw , blow, draw, draw etc. ) would really be more helpful. I've got the tongue block thing down, and know where and how the notes sound, but that breathing thing seems to be the key IMHO.