When I read your post, I had to smile because I remember the days when my son, now four, first started talking at 9 months and never stopped. My daughter, now two, started talking at 10 months and also has never stopped - in fact, she probably talks more because she has a big brother to teach her the ropes.
When my son first started pre-school at three, his teacher wanted him screened for ADHD because he talked TOO much, but my husband and I asked her to wait a bit longer to see if the daily routine of her class structure would make a difference. It did and within three weeks, he was quiet when it was appropriate. In fact, he became the teacher's favorite and the class leader because he engaged everyone in discussions and shared his observations about life openly and freely. He's very much like my husband in that way.
My son sometimes has problems with interrupting others when they're talking, especially if he's just met them, but we know it's just the excitement of meeting a new person. He thought just saying "EXCUSE ME" was an all-access pass to break into someone else's conversation, but he knows better now and that just comes with age and constant reminders.
Now, we're working with him on what NOT to ask people. He recently asked a lady in our doctor's office waiting room where her husband was, and she told him that she didn't have one. Because she had a little girl with her, that just threw him totally off (in his little mind, EVERYONE has a Mommy and Daddy) and he kept pursuing her whole life story. She was visibly irritated and I was very embarrassed. I told him that other people's lives are their business, not his and if they want to share with him, they will. It was a hard lesson for him because he's very open about sharing with others, which is actually a very good system of accountability for me and my husband. :)
At night, when he's over-stimulated, he used to babble on, but I've since told him that while Daddy and I will always listen to what he has to say, others may not all the time because it's not about how MUCH he says, but HOW and WHAT he says that will get people interested in listening to him. Now, we can actually see him THINKING before SPEAKING and it's great.
Patience, love, understanding, and guidance is how you'll get through this new and exciting time. Blessings to you and yours!