Content Styles:
Another consideration is the writing style(s) that you plan to incorporate. Styles might include; instructional, informational, opinion, personality, video, audio, guest posts, etc...
Determining your ideal style mix will also help you in planning out your content calander.
For Example: If you post weekly and your goal is mostly opinion, with some informational and instructional content, then you might choose a strategy of 2 opinion posts per month, 1 informational post, and 1 instructional post.