You won't get a contract until you get here and pass the medical/police checks (you and your husband and child if he is old enough). You should get a letter of offer that outlines exactly what is included in your package - I would ask them to forward one to me so that I can make an informed decision.

I would strongly advise you not to come before you see something in writing or if the something in writing is contradicted orally. There are some unscrupulous employers who will promise a great deal but be reluctant to back it up with the written word.
Signature line > "You can't fix stupid"