[RichardJ]

You might want to do more than just lubricate. Lubrication can be a two edge sword. Too much lubrication attracts the dirt and in extreme can contaminate the shoe lining.

You need to clean up the loose rust and crud, inspect for excessive wear and lightly lubricate wear points as reassembling. Wire brushing the parts an a wire wheel is all that is necessary. I've never replaced springs unless they are broken.

Start be inspecting the backing plate pads. This is far more important than buying a bunch of new springs and parts that never wear out. If the shoes can't slide in/out on the pads, nothing else will make the brakes work as they should.

I've welded the pads to add material so that they can be ground/sanded flat.
Lubricate these pads, but sparingly. They're right next to the shoe lining.