Puppies need to stay together with mom supervising until they are 8 weeks old....in most states, that is a law, not a suggestion or opinion.
You should start them on real food NOW - Mom is NOT going to want to let them nurse alot because they are getting teeth....she will check in on them, give them a small amount of time to nurse and leave quickly.....this is her wanting to wean them!!!! I like to use goat's milk and baby cereal (rice or oatmeal) and within a week, add raw ground meat or if you don't want to buy that, soak puppy food - a GOOD brand!!! - in goats milk until soft ....feed at least 4 times a day..... slowly transition to dry kibble by soaking for a shorter time, phasing out the milk for water and by the time they are 7 weeks, they should be eating dry kibble. They should also be wormed - DO NOT BUY GROCERY STORE/HARTZ MOUNTAIN products - you can get liquid wormer marked for goats at a farm supply store or online....get STRONGID - put it in food - 2 days, wait 10 days, 2 days, wait 10 days and 2 days - a total of 3 times....
Take to vet for check up and 1st vaccinations at 7ish weeks old.
Good luck!
Lee