You might search for the following trainers on YouTube - Janice Gunn, Adele Yunck, and Connie Cleveland.
Michael Ellis has some great videos re: verbal markers, etc - click videos on The Michael Ellis School for Dog Trainers
Also, the puppygarten videos on the following site are awesome - Competitive Obedience Toolbox
PAM Guardyan's Gavin, VCD2, CDX, RE, AX, AXJ, AXP, AJP, TD
PACH Guardyan's Helki, CDX, PCDX, RN, MXP3, MXPB, MJP3, MJPB
Guardyan's Kamikaze BN, CDX, RE, OAP, NJP
Guardyan's Kricket BN, CD, NAP, NJP