Rust removal tips and tricks?

I don’t remember how this knife came to be in my possession, but it has clearly seen a lot of use. I don’t know anything about Case knives except that it’s a well known and respected brand. I’d like to get some rust off, oil it, sharpen it, and put into my rotation. I’m comfortable re profiling and sharpening, but I’m not familiar with rust removal or even carbon blades in general. Where should I start?