OK, it would help to know the basic types of child care services, and different philosophies that child Care centre has, See if they have a web site. Create your own philosophy as well, using words like collaboration with families, children and encouraging diversity. Be familiar with regio Emilia, and socio cultural theories if you really want to impress them. They will proberbly ask you what contributions you can make to the centre, which would relate to you strengths but also your background, i.e if you can play an instrument, know another langage or have experences with plannaing activities or in the case of having a centre that uses Emergent Ciriculum adapting spontaneous activities related to the interests of the children. If your familiar with Vygoksky's zone or Proximal Development where you use activites that are slightly harder than their capabilities that would also help, to demonstrate your understanding of assisiting children with their learning.
Just remember you want to collaborate with the chidlren and learn with them rather than teach them. Good luck I'm sure you'll do fine.
I'm an EC teacher