I have two Highly trained adult Doberman's. There are a few things to start now!
Little to no talking is needed. I would strongly recommend the program "The dog Whisperer" or google that to see his info on line.
He has several books out, and a television show. I use mostly hand signals and no voice.
They do know the words, stay, sit, come, no bark, lay, stay, no kitty, gentle, treat, back, eat, crate, night night time and kiss.
I use a nose lead, on walks which has been a god send for aggressiveness in the streets with other dogs.
Always be first, out of the house or back in, everything you give them, including toys belong to you. Absolutely no mouthing a human. If she bites or mouths, you must use your hand at her neck and dig your thumb in firmly but not to hurt. Your hand is the mouth and the teeth are your fingers. This is what an alpha dog does in a pack to put them in there place and let them know the behaivor is not allowed. If done once or twice they get the message quickly....no "ows" needed.
You must be the alpha and never let up.
R