Personal Shopper Positions

I would like to be a personal shopper for individuals. Does anyone have suggestions on how I would charge ?
I am already in a position to get a lot of customers. I am very outgoing and personable and the people that I have contact with are very busy business owners . I use to be in the gift business and shopped the major markets . I am not wanting to shop on that scale but much smaller.More of personal gift buying for people who are too busy and want someone who is creative and has very good taste. Any suggestions?
I just want to know how you talk someone in to paying you to spend money. I guess if I was going to do it, I would charge 15% of whatever I was buying for them. Pray they want you to buy them a multi million dollar house!
Family Guy Jackee Harry Joke