Hello Everyone

I am new to the forum and just bought a 91 525IA with 101k miles on it, I really don’t know anything about them except I love the way they handle!! So my question is: What should I expect as far as Maintenance, repairs and reliability ? I have read a lot of the post and it seems that they run forever as long as they are maintained, being a used car I do not know any history on it besides what I could find in the car fax report. What do I need to do right away? All the fluids are new, but inspection display only has one yellow light remaining? Any thoughts would be greatly appreciated. Thank you, Tina