Creating a valid and reliable survey is something best done by experts. However, you need to understand what should be in a survey in order to be a good judge of surveys. The use of general questions such as "rate how well the customer service desk met your needs" is a good question to know how the desk personnel are doing overall, but will not provide you with useful data to help improve if customers say do do not think the desk personnel are doing very well.
In creating a survey, you need to think about the "core process" of your site. What business are they in? What are the major components? What customer groups should be surveyed (there are usually more than one customer group for any process). What are you trying to accomplish? Are you looking for a feel good report card, or data to improve?
The following information is how experts would go about designing a survey. You should think about this (from Quinn article) in designing a simple survey for your assignment.
Ask customers (e.g., formal and informal interviews, casual conversations, focus groups, etc.).
Step 1: Use less structured research methods for determining customer needs, expectations, and delights.
Direct observation.
Participant observation.
Individual interviews.
Focus group interviews.
Content analysis of spontaneous letters and comments (complaints and praises).
Process flow diagrams.
Step 2: Use more structured methods to prioritize what is important to customers.
Mapping major dimensions/indicators of quality.
Identifying quality characteristics of each dimension/indicator.
Planning and conducing a pilot test (who, when, where, how, data collection forms, and interpretation).
Step 3: Use structured methods for measuring quality based on customer judgments.
Personal interview.
Telephone interview.
Self-administered questionnaire.