Puppies should be weaned at 6-8 weeks of age. At this point they need their first vaccinations. Depending upon the size, breed, and temperament of the puppies 6-8 weeks of age is when they can be rehomed. With smaller dogs I recommend keeping them until 8 weeks of age.
You can sell them at 6 weeks but its better if you wait a week to see if it can do okay with out its mother. So try and keep them separated after six weeks.
You can sell puppies when they are 6 weeks old you need to make sure that they are eating and drinking good before you let them go to new homes
Usually at the age of 8-10 weeks is the best time to sell them.
8 weeks and make sure there eating on there own.
Usually to make sure they are ready usually at 8-9 weeks of age.
Six or seven weeks just depends if they are eating and drinking on their own or not