You can produce content yourself or get service from a professional company that offers content production services.
Your strategy and preparation need to be SEO compliant, but it can be said that the user is able to access the information they want while producing content. The target audience of search engines is the users who search and their aim is to provide the content most suitable for their searches. For this reason, the contents should be produced as user oriented. After you produce your content, you should prepare important criteria (such as title and meta description) by focusing on the user.
The length of the content is of course important, but your content should contain the information that users are looking for and contain points relevant to the subject you are producing. For this reason, the length of your content that you think you have sufficient information about the subject will actually be the ideal length for you.