Here are some of my kindergarten essentials.
-2 different cover sheets for homework designed specifically for kindergarten. The first half the year I use first page telling parents what letters we are working on. The second half of the year I use the sight words I want the parents to know that we are working on.
-A detailed outline of dates, letters, books, skills, and sight words that will be taught 2014-2015 school year.
-2 different progress reports that I send home every 2 weeks or so. You can easily adapt it to what skills or math concept you are working on
-My reminder cards. I usually print these out to help parents remember when specific days are coming up like wearing a certain color, bringing show and tell, field trips, etc. Easily editable for any thing you need.
Hope this helps!
Don't forget to check out my sight word table names!