I started giving it to mine at 4 weeks. I put milk in a saucer but also ground up puppy food mixed with goats milk. They made a mess out of it for the first week learning but they caught on.
Don't know about the food your feeding. I feed Call of the Wild kibble for mom and pups. I feed Chicken soup puppy wet food. I don't recommend changing food to many times right now it might upset her stomach.
On the worming you may just want to take a stool sample into the vet to check for worms. If they don't have them no need to worm.
__________________ Melissa 
Wvyorkies |