You know, the best tip I can give you for teacher preschool is to have fun with it.
I know that's easy advice to give, but it's something you should consciously choose to follow. The kids will always respond positively to someone who seems happy and in control. They feel safe when they can see you're right there with them, enjoying the same things you are.
And making it fun for them makes everything so much easier. I know my nephew had interest in learning to read until he discovered it was like a game. If he sounded out letters, the whole family would join in with him.
That's the kind of environment you want to create for your kids at school.