Lorrie O, this is a business transaction. It is not necessary for you to know all about your car or to be a mechanic, if you did or were, you’d change your own oil. Just approach this as a business transaction and check your owners manual for the needed service for your time/mileage.
The owners manual specifies services as R for replace or I for inspect. Inspections should not cost very much as most only take a few seconds to do, although checking brake pads or transmission fluid will take longer these days. Be sure to have all the things done for each interval, not just the oil change and watch for the upsell. If its not in the book, they are not to do it.
Calling around to get several quotes for the services listed is a good business practice. If the dealer is a lot higher that an independent, let them know and ask them to justify those extra costs. Its OK to use lines like “Does your mother know you overcharge like this?” or “aren’t you ashamed to ask that much?”, or one of my favorites “I don’t need the gold plated filter, a painted one will do,”