Introducing a new puppy into our home with our 2-year old dog?

[Tom]

We have a 22 month old male Havanese and are just about to get a 10 week old puppy, another male Havanese, a little brother/companion. Our 2 year old Havanese is completely house trained and has the run of the house when we are gone. I would appreciate some good tips on potty training the new puppy, should he be crate trained as our other one was, are they to be together when alone, or separated?

We want to make the introduction as smooth and comfortable for both our adult dog and new puppy as we can. Any helpful info anyone can provide would be great.

Thanks,
Our dog gets along great with other dogs, loves to play, so we should be ok there. When they are alone do you recommend they be crated together or not?