If your father had an amateur radio license (not a CB license) back in the fifties he took the exam at an FCC office unless he was disabled or lived more a couple hundred miles from the FCC place. Many years later the amateurs took over the administration of written and, when it was required, code testing.
Get the book or books from ARRL. There are also ham exam testing services for practice available on the internet so you can test yourself and when you go to take the actual test it will be very easy. There is no longer any code requirement for any ham license. When you're ready for your test you will be able to find a group who will administer the test; they're called "VEs" for Volunteer Examiners and if you ask around for VEs everyone will understand what you're looking for.
Good luck and welcome to what I and many others consider to be the best and most interesting hobby in the world.
73 (means "Best Regards" when sent in Morse Code.)
Tom, W2NJS
Washington DC