The following is a summary taken from an article. Use this information when posting army lists or follow the link to read about the various elements in detail.
Writing a Warmachine or Hordes Army List for Feedback
Things to include in the Subject Line:
1. Points Cost
2. Game or Tournament Format
3. Chosen Warleader's Name or Faction
4. Theme Force Name or Tier Level (optional)
5. Opponent (optional)
6. Tactic to be Employed (optional)
Things to include in the Body of your post:
1. List the Models with the points cost
2. Relevant Bonuses (optional)
3. Model Restrictions
4. Describe How You Expect the List to Work
Of these things, #4 "Describe How You Expect the List to Work" will get you the most responses when it's written well or well thought out.
I hope to include more links to articles in this post.