Cheri J. Meiners M.Ed. has written books with lessons & questions (I bought the first three on amazon.com and will let you know what I think):
Know and Follow Rules
Talk and Work It Out
Respect and Take Care of Things
Share and Take Turns
One that's in the library I will use is Have You Filled a Bucket Today? A Guide to Daily Happiness for Kids by Carol McCloud.
This blog has some fun ideas to use Pete the Cat, Chicka, Chicka, Boom, Boom, and the Kissing Hand on the first day that I may be able to stretch into those first three days:
http://thinkwonderteach.blogspot.com/2012/08/first-day-of-kindergarten-plans.html
Don't explore too deeply on this blog - just use this first day link for ideas! :)