Since the description of a "virtual personal assistant" is so ambiguous, an emphasis on education or experience depends on what services will be offered and what skills are already possessed. Experience in a variety of fields can be helpful: secretarial/administrative, reception, customer service, human resources, billing, etc. And, as much as this position can be discounted in today's society, don't forget your most important role as a parent which teaches multi-tasking, time management, grammar correction, diplomacy and learning to pick your battles.