This is my first dobe pup, too, Audrey. My Loki was a re-home rescue from a fine breeder. Dexter was a doberteen, kind of a "reject" from a not-very-ethical breeder, we got him for a discount price because of his bum leg. (Which has been rehabbed nicely.)
I had no idea what to expect with a pup this young. Holy cow! Into everything, all the time. Have to really keep her busy, exercised, or she is on a tear to search and destroy! Funny, but really takes energy and patience. She's been good for me.