Hi @Red_educativa S.L.,
I would suggest using rel="prev/next" in this situation, yes.
When you are specifying a "rel" attribute you are specifying a relationship between the current document and the linked one. The value "prev" and "next" is specifying the relationship to be "The next [previous] document in a selection".
If you instead would use nofollow, google's spiders will not crawl the page. A nofollow value is "Links to an unendorsed document, like a paid link.".
However, this being said, it would be good for SEO to include a "view all" page. This will include all the content on a single page. You should then use rel="canonical" on the link to the view-all page (this will send users from search results to your view-all page. If you instead wish to use your first page in the series, you should only use rel next and prev (not rel canonical).
Have a look at this video from google for more information: http://www.youtube.com/watch?v=njn8uXTWiGg
I hope this helps.
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Jørgen Juel