Create a questionnaire using a Google form to find out what your customers would like
Who will use your portable speaker design?
What features are important to them on a speaker?
How will you find out these things?
Use this link here to find out about questionnaires
Write a design brief that highlights what you are going to make, who you are designing it for and what their needs are.
Here is the link to this document - make your own copy to fill in.