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

To give him little introduction to how things are going to be when he goes out. I just had a word with my baby telling him about the school but kids are so small at this age that they listen at that time, but forget everything when the real time comes. So, even if one has prepared them, it seems all undone when they really face the new environment. So, one has to be around for a while in the pre-school initially to settle him down.