There’s no imagination here. Lay down the notes of a scale in ascending order and start counting. First degree is the first note; second degree is the second note. That’s it. So on and so forth. But that’s the easy part. They are also called (in ascending order): tonic, supertonic, mediant, subdominant, dominant, submediant, leading note. Mostly, we use tonic, dominant and leading note. The rest are normally counted in numbers (so we don’t have to remember a lot, I guess).