I provide bookkeeping for my clients using QB Pro.
Rebecka can answer the Pro Adviser questions 'cuz "she are one"
I require my clients to have their own copy of QB Pro, registered to them, and I work on their files in the copy that is registered to me.
Payroll subscriptions are purchased for each company that wants payroll; I pass the annual cost on to my clients that want me to do their payroll.
Next?