Kindergarten?

My child rides the school bus. What will happen when his/her bus arrives at School? Tomorrow is my sons second day of kindergarten but the first time he'll go on the school bus im so nervous what happens when he has to get off the bus what if he just stays outside or what if he doesn't remember where his class is and doesn't know where to go or what to do ...??? And he's kinda shy to talk im scared he won't ask for help idk im just so nervous ...sending him on the bus is what works best for us but im so anxious i feel like in kindergarten theyre so small :( :( and im scared for lunch time do they have to walk alone to the cafeteria punch in their ID number and everything ? ugh its so hard !