Fostering 6 week old puppies

[mossrocks]

I am going to be fostering four 6 week old puppies who have been without their mother since 4 weeks of age. I will have them for 4 weeks before they are put up for adoption and I really want to do my best regarding their socialization and toileting and basic training. I have only fostered older puppies before and those all were with their mother until 6 weeks of age. Any hints?