Interesting looking Raleigh Sports. I've never seen one with downtube decals with a year.

Getting the shifter working to get it out of 3rd will make it a lot more rideable. Looks like it needs an indicator chain, some cable sheathing, and there's a little plastic (depending on year?) piece that inserts into the bracket on the top tube that keeps the sheathing from sliding through.

There's a youtube channel Velocopedium that you might find helpful.