Hi!
Welcome to the amazing world of chickens and congrats on realizing this dream.
You'll be learning on the fly and it never seems to stop. As your chicks grow, make sure you keep researching and asking questions so you have the info before you need it. Chickens aren't overly complicated but it's best to be prepared/informed.
Ok, so based on the information that you've shared I'll comment on your dogs. Simply put, don't let any of them near those chicks and you'll want to think twice once they are grown. While there may be some chicken friendly breeds, some dogs have too much of a hunter/play toy instinct. I believe terriers are the latter and you'll probably need to keep them away from the birds for good. As for your chihuahua, they're pretty feisty and I know one that kills rabbits and rats...not much of a nurturing breed...cute and loyal though!
So all that being said, I would prepare accordingly. If you need to make changes to your layout, now is the time before you chicks get older.
When you have more questions, and I'm sure you will, you'll find these forums to be a fountain of information and experience. Enjoy and good luck!