What are your preparations before your child entered pre-school?

Hi, I do not think there can be any preparation for the kid as kid doesn't understand it till the time he is in the school for the first time. I was counselling my baby for weeks before she finally had to go to school. Every night I used to tell her how fun school is going to be friends and teachers and new toys each day. So when the D-day came, my baby was so happy dressed and carrying the little tiny bag. We clicked the pictures of her first day and she posed happily for each picture, but after 20 minutes when we were in her school, she was howling like anything.