I am your man!
My name is Bodis Robert.
I was making a whiteboard animation for a company called tagsensors few months ago. It was a big project, and they were really happy with the results.
Imagine the animation go down like, you got the big ass white board, and a hand starts writing the text,dragging in items,dropping stuff,so on,so on.
I`m 100% that is what you are looking for
Best regards,
Robert