1. Start your first draft
Your writing plan should give you a framework to work with (but you might need to adjust it as your work develops). Remember to adopt a critical perspective and develop your points by using (evidence and) sources.
2. Follow up additional research
Go back to your research and find sources to fill in any gaps/points that may come up and that need evidence.
3. Revise and re-write
4. Complete referencing
Once you have organised your research notes and come up with an essay plan you can finally start writing up. Remember that writing is a process so give yourself enough time for your work to go through a few drafts before your final submission.