hi Purvi! and hi Navjot! i am that very "woman called Elena in dogspot based in gurgaon" and i do have some experience with small breeds like chihuahua and russian toy terrier.
Purvi, it is clear from ur question that u have never had breeding dogs. is this case i would not advise u to start with breeding chihuahua. it is difficult and involves a lot of risks. there is a lot of information online about chihuahua breeding, toy dogs breeding, etc. while developing the toy breeds people chose not the fittest, but cutest ones, trying to create tiny creatures with large heads and baby faces, in the process the natural reproduction instincts also suffered. sometimes these dogs cannot mate without human manual assistanse. they have small litters - usually 1-3 puppies - of relatively large size, often with a large round head. it creates problems for the female during whelping. sometimes natural delivery is not possible and caeserian section is required, which also does not garantee that the mother and puppies survive. recently i lost a young female and her puppies during whelping in spite of the timely medical assistance...
ur male is pretty normal. he may live his whole life happily without mating at all, just displaying this behaviour occasionally. but if u allow him to mate just once, he'll become much more concerned about this part of life and will look for more opportunities especially if there is a bitch in heat around. he will mark his territory - urinate - more, might become more aggressive towards other, bigger dogs, which is potentially dangerous for him as he does not realise that any bigger dog is much stronger and can hurt him.
if u r ready to take risk, try to get a female larger in size than ur male. but first read all the information available about dog reproduction in general and toy dog breeding in particular. it will help u a lot to take the decision.
if u have any other questions u r welcome.
as for stud services - here i cant help as i am in delhi. try to advertise or call the nearesr kennel club, they might help u.