For kindergarteners, there are lots of games you can do with flashcards. They like to copy exactly what you say, at least for the first two or three minutes before they get tired of that. That is enough time to at least introduce some vocabulary like colors, animals, body parts, etc. Then, you can do a flashcard cakewalk, call out a vocab word and have kids race to touch the flashcard, or let them try to hit a flashcard with a ball. It's also easy to teach kindergarteners simple orders like stand up, sit down, spin around, and clap your hands. They will just copy you. I recommend teaching "talk" and "shh, be quiet" early in the year. Eventually, you will be able to add some simple sentences into your lessons. And of course, songs with actions are very important.
Shelly Vernon's stories for preschool aged children are extremely helpful. There are games, flashcard, and coloring sheets to go along with each story.