I start with the three points of rider contact. The handlebars, saddle , and pedals.
It looks like you have the original bars on the bike. They are a really nice classic Maes bend. Those are keepers.
Saddle? Hard to beat a Brooks or Wrights. I think a Brooks B-17 narrow was standard on the Super Course for many years.
Pedals are a personal choice. I like basic rat trap pedals. Maybe you want clipless, or a platform.
The Nervsr crank on your SC is kinda cool. And Huret Jubilee derailleur is top notch.
A good set of tires will make for a smooth trouble free ride.
Tune it up lube and ride it. You will figure out what it needs or what you may want to change.