My stance is a given, but if you're certain about going through with the pregnancy, I'd recommend making a new topic about the whelping process, pre-birth, and post-birth care. You'll likely get more detailed replies about the entire pregnancy process there.
If you haven't already, I'd recommend lining the whelping box with towels, not straw. Straw can be very dusty and can cause respiratory issues in newborn pups. Also, do NOT use puppy pads to line the whelping box -- they're usually artificially scented and can cause the same respiratory issues as straw.
These pups are going to very fragile and very small because of the mother's age. Precautions need to be taken to make sure they're in a completely sanitized environment, as their immune systems will be underdeveloped.
You need to monitor mom constantly to make sure she isn't getting any swelling or redness in her nipples, or getting aggressive with her pups. New mothers can be a bit rough with puppies, and there's no guarantee that her maternal instincts will kick in because of how young she is.
You need to have a back-up plan in case anything goes wrong. Have the vet on speed-dial. Have blankets and a carrier crate ready in case you need to make an emergency trip.
Get Esbilac formula for puppies in case mom doesn't let them nurse. The vet should be able to show you how to syringe-feed the pups in case it needs to be done.
I'd also recommend getting a large heating pad with a temperature control, and have a quiet place ready for the puppies where mom cannot reach in case she becomes aggressive towards them or rejects them.