My eldest daughter went into child care when she was 14 months old. I found that taking her there before her first day and letting her have a little play was a great help. I did this a couple of times for about 1/2 hr staying there with her of course. She was then familiar with the suroundings and seemed to settle in really well.
I'm not sure what you mean about the back pack! Do you mean food? If so pack her what she would normally have at home but make it more fun. For my DD I would cut her sandwich into shapes (with biccy cutters). I would also do this with fritz. Actually anything I could. I would also give her something that was her special 'child care' treat. Something that she would'nt get at home.
As for the crying. I actually didn't but she did. I walked away with my heart in my toes. It was awful. I think the first day I rang them 5 times to make sure she was ok. They told me she was fine but I didn't believe them. Even after taking her there, I think the leaving her was a bit confusing (for both of us). After the first week though she was fine. Me leaving was more of her pushing me to go so she could play. She really looked forward to going after the initual week.
I hope this all makes sense and is of some help to you. Keep smiling and remember the interaction with other children is really good for her.
Hope, SA, 3girls Jasmine , Millicent & Phoebe