You will involve yourself in enormous amounts of writing, more writing, perhaps, than you've ever done in any other class or any other situation in your life. There is no way around this.
Writing is a process.
The written word comes into being through a process of continual working and reworking, vision and revision, thinking and rethinking. Writing is also a craft, and there is no other way to improve your writing other than practice, consistently and constantly. You will also be reading vast amounts of material, essays, articles, papers, books in order to absorb and discern different techniques different writers use in their own craft. You will work to strengthen your critical and interpretive thinking, and your consciousness of that thinking, in order that you can then put those skills to use in your own work. These aforementioned concepts and others you discover along the way will shape the information in your essays.