Can anyone suggest how to calculate a sample size and sampling design for a national survey?

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Adam Fforde

Any standard statistical textbook, but if you do not know it would be very risky to agree to do the survey.

Dibya Jyoti Kalita

there are different methods to select sample size. you will get all these methods in any standard statistical book.

you can use one indian writer book-

Book name- Statistical Methods

Author- S. P. Gupta

Publisher- Sultan Chand & Sons, New Delhi

Alireza Ghasemizad

You should use kerejcie and Morgan(1970) table or calculate sample size with chochran formula.