Animation designer

Hi, we running several e-commerce platforms selling gifts (babies, adults, wedding etc) and for our baby site we would like to set up an animation (in form of short films) to introduce our products and create branding on FB/Twitter/Youtube for our sites. We need someone who not only can design a cute little toy dog (and any other characters), but also who can get involved in writing the the story book for us (and with us).
thanks
Elisabeth