Young, Single, And Adopting: What to do the FIRST night! - hate the idea of checking for bugs/lice but it's a good idea and there are good & tactful ways to do this step discussed in the article. Make sure kids know they're safe. Show them you locking doors/windows etc. Ask about a light at night. I like to call them "mini lamps". Makes kids feel less childish and self conscious about using them.
There are no guarantees in foster care, except one - God is sovereign. Foster care is a beautiful expression of the Gospel. It demands a selfless, costly and potentially painful love, for the sake of a child gaining much as you willingly give all.