Proficiency in academic writing takes practice. While you can use scholarly articles or book chapters as models, there are other resources on campus to support you as you develop a work flow and process.
Air and Light and Time and Space: How Successful Academics Write by 
How to Write a Lot: A Practical Guide to Productive Academic Writing by 
Writing a Proposal for Your Dissertation: Guidelines and Examples by 
Clarity and Coherence in Academic Writing: Using Language as a Resource by 
Grammar Choices for Graduate and Professional Writers (2nd ed) by 
Helping Doctoral Students Write: Pedagogies for Supervision by