There is a new liquid monthly treatment for fleas and ticks out called Revolution. It protects against fleas, ticks AND heart worm and is very good. It can be used on puppies as small as 6 weeks. Also you will need to spray your home. I recommend Hot Shot Bed Bug and Flea. It is the safest and most effective treatment I have found with a fair price.
The most recommended way is to bathe the puppy in warm water and a dishwashing detergent before manually picking off the remaining fleas using a flee comb. You can also spray the animal using a mixture of; lavender oil, eucalyptus oil, warm water and cedar wood oil placed in a spray bottle or bathe the puppy using a puppy shampoo.
Use a good flea shampoo then get either Frontline or Advantage Flea and Tick medication. Dont use the cheaper brands as they either work poorly or not at all. You can get Frontline and Advantage from most veterinarians. You can get them at pet supply stores as well but they can cost almost twice as much.
We had 5 brand new boxer pups like days old and the mother had fleas bad and the vet told us to buy bottle if frontline spray and spray onto a cloth and wipe the puppies with the clothe and do the same to mother avoiding the tits