I am trying to set up a gift for Fire tablet for a child. I do not want them to have access to my content.
If you are setting it up, you are setting it up using your account and payment methods and credit card card access. Is that what you intend? Unless you plan to retain control of administering it you will be giving the adult password to whoever will be doing so and thus access to everything.
NOTE: I do NOT speak for or represent Amazon in any fashion. This is a customer to customer forum.
Disclaimer: I have examined any sites I provide links for and have determined them to be safe but I make no promises about safety, content, ads served or anything that might make you clutch your pearls in horror. Use discretion clicking on links provided by total strangers such as myself.