I haven't officially started teaching these concepts and skills, yet. However, I think I'd be prone to showcase sequencing by referencing the sequences we follow at school. For example, I teach in the Media Center, so I would talk about the steps we take: check in your old book, get a shelf marker stick, find a new book, check out those books. Then I would go on to explain that if we were to write out those steps, we would have our "library algorithm." I'd like to say that, since students already know these steps, that grasping the concept of sequence and algorithm would be easy.
Then I could even go further, and explain if we were to do those steps over and over, we'd have a loop. I think this real-world application, that they already know, would be a great way to introduce these concepts and skills.