Provide an overall description of your sector. What products/services does it provide?
Identify the top players in your sector by market capitalization and/or revenues (say top 5 companies). How about the top 5 companies in sales growth? Top 5 of the sector's biggest 10 companies by market capitalization in net profit margin?
Describe the level of competition market share, are there economies of scale such that big firms dominate? etc; who's getting on who's tuff? Is there a threat in a form of disruptive technology (e.g., a technological breakthrough) That could turn the table on existing dominant players in your sector?
Is the Sector consolidating (i.e., mergers & acquisitions)?
Who are the customers? suppliers? Where are they located? Is there an issue with supply chain disruption? Is the supply chain vulnerable to politically driven trade wars?
How is your sector performed vs. S&P 500 and Nasdaq over the past 1, 3, 5, and 10 years?
What is the outlook for the Sector? When does it thrive/shrink?
What key economic indicators you find relevant to watch to understand the potential impact on your sector?