Build the questions into a complete questionnaire or interview guide that can be used in the survey.
Start by thanking the respondent for helping and then give a brief explanation of the purpose of the survey. This will help the respondent feel comfortable with the questions and may assist them in giving appropriate answers.
Give instructions on how to complete the survey, either for the interviewer or questionnaire respondent. Instructions may include:
How to fill in answers (writing, ticking, circling, etc.), possibly with examples. Repeat this, at least in summary, on all pages where it applies.
Where to go if questions may be skipped.
The date by when the survey should be completed.
The person to whom the completed survey should be sent.