Skip,
I'm not a commercial tier, but I just have a suggestion for you! If your doing good tying jigs, then I wouldn't extend yourself into fly patterns, unless like you said, someone requests the flies from you. Don't waste your time or money tying flies for who knows who, when you have established customers buying your jigs.
Another thing Skip, is your location, do fishermen use flies in your area?? The reason I ask this is feedback from the flies you might tie would provide you with immediate results from fly fishers in your area.
The last but not least observation is....Making a profit selling flies is possible if their made in India.
Call a Fly Shop and ask them about tying flies for them.
Just my thoughts.
Doug