Spoiled, I do not mean this to be unkind, but you are NOT qualified to be training other peoples' dogs, and if you are calling yourself a trainer, and taking on clients you can get in trouble.
Here is a list of certifications my own trainer has. I suggest you get at one or two of these before you do anything with anyone's dogs.
B.Sc. Degree Animal Science,
Iowa State University, 1968
U.S. Army Veterinary Technician,
Walter Reed Army Institute, 1970
Graduate Baltimore City Police Department,
Canine Instructors Course, 1976
Certified member of Professional Dog Trainers
Association of Canada, 1982
Training Director for Club Schutzhund Soulanges
Certified and licensed D.V.G,
Schutzhund Trial Decoy, 1984
Owner and Trainer,
TRIL Kennels, January 1984