I think one of the very best things that one can do with their new puppy is play. Behaviorist Patricia McConnell has said "play isn't what makes our relationship with each other better, play is what creates the relationship in the first place". Play develops trust, communication and develops a love of working so when you start to train, it's all "play" to your dog. So when you get that new puppy if you have a spare few minutes and don't know what to "train", just go out and play!