That's good you haven't touched the babies. It's best not to touch the nest for 10 days. If one of the babies crawls out of the nest to a different part of the cage, leave it and it will crawl back or the mother will get it.
Make sure there's plenty of food and water for the mother so she can feed her new babies. Try to keep things calm and quiet around the cage so that the new mother feels safe. If you have a hamster wheel in the cage, remove that so the babies don't injure themselves on it.
After about 5 days the babies will be able to drink on their own. At this point you should lower the water bottle so that they can reach it.
By the 7th or 8th day, they'll start looking like hamsters and nibbling on food.
Around the 13th day their eyes will open, and at this point you can clean the cage. They should stay with their mother for about 28 days, and then the different sexes can be placed in different cages.
Let me know if you have any questions or there's anything I haven't answered.
To tell the sex of your hamsters, check this link which has pictures to make it easy:
http://www.petwebsite.com/sexing.htm
For more information on baby hamsters see:
http://www.hamsterific.com/RaisingPups.html