Routine help please

I have ok skin. I don’t have crazy acne or insane redness but I want a routine. I want to wash my face and moisturise it and put a serum on and all of that and I wanna make it the best it can be but I’m also scared if I start using skincare that I’ll mess my skin up when it’s already ok you know like don’t fix it if it ain’t broke sort of thing. I have like little bumps on my chin and my nose and make up never wants to sit on my nose and it doesn’t really stay I have dark circles and some discolouration I also have a connective tissue thing so my cheeks and eyelids are sagging a bit at 22 so any advice for that would be incredible. Please and thank you