At an early stage in your research it would be a good idea to find out what information is already available about the problem that you are researching, for example in:
If you were conducting a small-scale research project in your locality about the use of contraception by married couples, what sources might you want to look at as part of your consultation?
You may find that there are statistics available in your local health office, or recent reports written by the Ministry of Health or NGOs specialising in family planning.