[METAL]

Hi there!
This is my very first posting here. I'm from Brazil and I've always had dogs since I was born. Most of them were of "undefined breeds", I had a spanish cocker and a pointer as well.
Now my girlfriend game me this little Rottweiler (I always dreamed to have one), we call him "Homer" and I'm worried 'cos I don't wanna mess things up. Here's the deal:
We have another 2 "undefined" dogs (mom and son, Suzy and Bobby), and they're kind and delicate, but they're pretty coward as well with people (I mean the'll bark at strangers but if the person shows any reaction they'll stop or even run away, or run and bark from a distance). Since we first showed them Homer on last sunday, they seem to be running away from him all the time, I just can't put them together. And yesterday Homer started to follow the older one (the "mom", Suzy) and she gave him a hard time, we had to run for him. I can't understand why 2 "adult" dogs would be afraid of a little puppy! I think it's something like "let's give the freshman a hard time" or "I don't want new friends, put that puppy away". I've had dozens of puppies and never had this kind of problem, the babies were always welcome by the older ones.
Homer cries a lot and he seems to love people. But he won't sleep if he's alone, there must be someone around to look over him. I don't know if that's because he misses his mom and brothers or he's scarred or something... Last night he was crying so loud outside that I had to bring him in to my bedroom and stay with him. He slept like a child then. Is that normal?
Another thing... He'll wake up and play like crazy for about an hour and then sleep for another hour. I that normal also?
And a last question... Someone told me if I play with a Rottweiler the way I do (making he chew on toys) would make him aggressive... is that true?

Well as you see I need a lot of advice, so any would be appreciated. Mostly about how to make the 3 of them get along and how to play with Homer and educate hime without spoiling him or making he grow up as a coward (as the other 2 older ones). I'm not asking for advice for his whole life, but what to do now that he's still a baby, what would be right and wrong, etc.
Thanks!