I just picked up a 1991 Trek 1200 and I oiled the cables and chain and even put grease around the pivots for the cables and grease on the cables themselves, but there three things I've never done and may need doing since its 19yrs old.

Do I need to grease the pedals? I will be getting new pedals since these are Shimano clipless. I want some platforms. Wanna trade?

The steering head bearings. Is this something I can do with basic tools or do I wait until it needs it.

Same thing with the bottom bracket. Is there a write up on how to do this? I've looked at a very basic mechanic book at the library and it says I can knock the lock ring off with a drift and hammer. And on the non-drive side is left handed, right? Meaning, I turn clockwise to unscrew it.

Any help is greatly appreciated as I want the bike to be safe and last.

https://sheldonbrown.com/

https://www.parktool.com/repair/

https://bicycletutor.com/

https://www.mytenspeeds.com/My_TenSpeeds_1/

You'll need some bike specific tools, like a crank remover, correct size wrench for the headset nut, cone wrenches. Buy what you need as you need it. Check Ebay, CL etc too.

You need to do the wheel bearings too. Somewhere there is a thread regarding what to do on an old bike it may be in the Classic and Vintage forum.

Here's another spot to look

https://www.bikeforums.net/showthread...highlight=lube

Just do it.

I think that dedhed has given you some excellent advice. I'd take it one component at a time - usually the hubs are the first part that needs overhauling. Get yourself a pie pan or something similar to keep all the little parts in so they don't get lost. If (when) you get stuck, post a more specific question and I promise you'll get some helpful answers.