Try to find someone who is a mother herself, you have a better chance (just chance, not absolute) that she will take better care to your new born baby.
Sooner you will get the maid arrive the better. Because (1) it will take time for both parties to get use to each other; it's true not only to a maid, but even a relative who will live in your house; (2) on your first few weeks of giving birth you may be emotionally too sensitive, getting a stranger in your house may worsen your feelings irrationally.