How about this book from Gymboree? It is chock full of different activities that your helper can use to interact with your baby and engage his senses. There's a different activity for each day so there's no reason to get bored! I'm intending to get a copy for my dad so he can use it with my daughter. The activities are structured in line with their development. http://www.amazon.co.uk/Activities-Your-Toddler-Will-Love/dp/190582517X
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Is the helper also tasked with housework and to cook meals? Then I think just doing the basic baby care is already good enough. It's a little unrealistic to also expect the helper to engage and teach baby. My advice - send baby for classes or do it yourself. :)
thanks