When you get the course, first read the INTRODUCTION.pdf document.
After that, you can start watching the spartancourse_000_intro
If you don't have your human base mesh ready, watch spartancourse_000b_add_characters
The main course starts at spartancourse_000c_reference and spartancourse_001_helmet_modeling
Then, just follow the numbering of the uploaded files.
There is a bonus lesson spartancourse_003b_crest (showing you how to create the maginificent Spartan horsehair crest) and spartancourse_036_height (giving you a sneak peek at the techniques from the upcoming Spartan Warrior Texturing course).
In case you won't understand anything about the techniques shown in the main lesson videos, you can watch videos with spartanCourse_0XXrealtime written in their title - these are complete realtime recording of my workflow (no commentary).
In the end, if you want to give me a Feedback, please do, either here on BlenderMarket or open the SURVEY.pdf and click on the link there...
Thank you so much, my friends!