Welcome to the forum!
I have posted (as everyone knows) quite a bit about replacing sway bar bushings (front and rear) on these cars.
Here are several discussions on the topic: Replace FT & R sway bar bushings
The creaking and sagging is probably not the shocks. Typically it is jounce and rebound issues that describe failing shocks.
I would suggest carefully inspecting all the links, bushings etc in both the front but especially the rear suspension. Some series of springs, typically rears, do loose their stoutness over the years, less common on the 201 series cars.