Most Pomeranians will be ready to leave their mother by 8 weeks old. This is the typical age that puppies are able to go to their forever homes.
Before they go, it's important that they have received all of their vaccinations and have been dewormed. They should also be microchipped, if you plan on getting one for your Pom. You will need to provide proof of these things to the breeder before taking your puppy home.
At 8 weeks old, Pomeranians are still very much babies. They are not yet fully potty trained and will need a lot of guidance and patience as they learn what is expected of them in their new home. It's important to make sure you are prepared for this before bringing your Pom home so that both you and your puppy can have a stress-free experience.