As for the breed choice, Beagles are nice dogs and good with children. Just keep in mind that this dog has a louder bark than dogs of its size, so it is a good thing as you get a small dog with a big dogs bark.
Now this breed is getting popular as a result of which problems crop up like in any popular breed. I am happy to know that you are looking for a genuine breeder of beagles and not just interested in getting a beagle from anyone.
First of all it depends on how much you wish to send. Accordingly look for Champion parents etc. Now again, a breeder may have champion dogs and litters from them, but not all pups from champion parents will be show quality, hence you will find pet quality pups also with the same breeder which will be cheaper. Delhi has a number of good breeders and I would suggest that you contact the Gurgaon Kennel club members whos contact details you will find on this site. On the homepage go to Gurgaon dog show pics. and then click on members etc. Mr. Mukul Vaid is a genuine breeder as per my knowledge and is also a show judge who lives in Delhi.
Please see both father and mother of the pups before deciding to buy the pups. the parents should be KCI registered, see their papers and if they are champions or have won CC then it is better as that says that a dog if a good representative of the breed.
Buy a pup who is atleast 2 months old. All the Best!