There are varying opinions on what food is best for dogs...
As a general rule stay away from grocery store brands...(Pedigree, Purina, Kibbles n Bits, ect...they are chock full of harmful chemicals and preservatives that will end up compromising your dogs health.
Brands such as Science Diet, Eukanuba, and Iams are really not much better than your grocery store brands..they are slightly better but the ingredient list still is not great and for what you are getting they are overpriced...The appeal in these foods are vets recommend them, most people don't realize that very few vets actually have the education and training behind them to be considered reliable sources in animal nutrition.
If your looking for a good brand of kibble that is worth the money then look at brands like Innova, Canidae, Flint River Ranch, ect...these brands are a bit pricy but their ingredient list is better, they are free of harmful chemicals and preservatives and therefore are healthier for your dog..a healthier dog means less expenses at the vet due to having to treat ailments that could easily be avoided by proper nutrition..
Whole Dog Journal will give you some excellent recommendations for what kibbles to feed.
And of course there is the alternative of not feeding kibble at all and going with a homecooked or raw diet.
In whatever diet you feed research first there is so much information available to help pet owners become more knowledgeable on animal nutrition..
Now in regards to you getting your new puppies....
There are so many concerns brought up...The person you are getting your pups from is letting them go far too early not only will they miss out on learning critical behavioral skills (like bite inhibition as was already mentioned) but you are getting a toy breed and the absolute minimum this breed should be allowed to go their new homes is 12 weeks.
You have already said yourself the breeder is not a good one and doesn't even know the basics of whelping, if she does not know the basics of breeding then it will go to reason she probably does not have a well bred dog. I will also venture a guess and say that your dog (which your post indicates sired this litter is a pet and not a breeding dog and probably has not been tested for genetic disease)
You could be setting yourself up for heartache in a pup that ends up with painful inherit temperamental or genetic disorders...
Every animal brought into this world deserves every chance to live a life free of painful genetic and tempermament disorders...Genetics are never a guarantee and even if the most careful breeding there are risks and gambles..The only thing a breeder can do is take every possible precaution in reducing the risk of painful genetic and temperament disorders by selective breeding and screening of prospective breeding dogs..
The breeding of these dogs is already done, but please do make sure that in addition to waiting the proper time period before bringing them home (trust me when I say the wait will be worth it) you have them spayed or neutered and please have your present dog neutered as well to avoid this situation from happening again....breeding is a difficult path, it can often end in heartache and it is a path best left to those who have the knowledge to do it the right way.
Good luck with your new pups.