1999 Toyota 4Runner What is really needed to maintain this

I would like to find a maintenance schedule that I can trust. I keep getting ridiculous recommendations from the service writers at the dealership. Sometimes they say, "You HAVE to have a BLEEP replaced, and the next time they suggest something else and completely forget about the BLEEP. I get the impression they have a repair dujour that they push and the next time it is another repair dujour, need it or not. Where is there a sane evaluation on what needs to be done and when? Thanks.