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Good luck! I'm sure you know this, but spaniels can be absolute lunatics. I'm sure there are far more knowledgeable owners on here, but main recommendation would be ensuring you teach them an 'off' switch from the very start. I'd be crate training and pushing through regardless of the initial reaction/response. Puppy classes, in my experience, are basically 80% spaniels with owners who are struggling to handle the energy.
Getting a springer. Should be a challenge but we love to get out and have lots of fields around here plus country pubs...
Edit: thanks for the book recommendations