Both new and existing businesses need to have a good knowledge of who will want what they offer.
This is discovered using Market Research.
The usual way of collecting information is through questionnaires.
Designing questionnaires and analysing the collected data is a highly skilled process and best left to someone who has experience.
However the largest part of the task is collecting the data.
Maybe wou have a market research project and want help collecting data. Maybe you have some time to spare and would be willing to help collecting the data.