You may want to choose a brand with a history. The brands covered in these books should be good candidates.
Encyclopedia of Global Brands 2nd Ed (should be available by June 1)
Encyclopedia of Major Marketing Campaigns
Encyclopedia of Major Marketing Strategies
Brand Failures: The Truth About the 100 Biggest Branding Mistakes of All Time
Rankings & Ratings
Finding your brand on one of the many brand ranking projects should be useful.
Interbrand Best Retail Brands 2014
Corebrand Corporate Branding Index
BrandZ Top 100
Forbes World's Most Valuable Brands
American Consumer Satisfaction Index
Business Rankings Annual (not just brands)
Market Research Reports
Market research reports offer one stop shopping for may of the topics you need to cover in the brand audit such as sales, marketing trends, competitive environment, and consumer survey results. If you don't see a market research report for your brand's category ask me for assistance as some reports are in specialized databases or difficult to find in general business databases.
Covers global consumer categories. Search by brand keyword or expand industries categories. Avoid the brand search on the landing page as it leads to brand share statistics without context.
Cannot search by brand but by broad category. Coverage for consumer products and services in the U.S. with limited international.
Provides marketing reports for many industries in the U.S. Some reports may be too dated for use.
You will need to search business news and academic research about your brand. These are the best points of access for both the practical and the scholarly.
Business Source Premier (EBSCO)
Case studies, news and data on global marketing and advertising.
ABI/INFORM Complete (ProQuest)
Business Source Premier is a full-text, scholarly and trade article database covering a wide range of topics including management, marketing, accounting, finance, economics, international business, operations management and management information systems.
Advertising Age Datacenter
The most comprehensive ABI/INFORM™ database, this comprises ABI/INFORM Global, ABI/INFORM Trade and Industry, and ABI/INFORM Dateline. The database features thousands of full-text journals, dissertations, working papers, key business and economics periodicals, country-and industry-focused reports.
News, reports and statistics about the advertising industry
Find out how your brand fares on the web and social media platforms.
Social Bakers Get analytics on facebook, YouTube & Twitter presence by brand
Alexa Get web analytics
Quantcast Get web analytics
SimilarWeb Get web analytics
e-Marketer is an international aggregator of data and reports on digital marketing from over 4000 sources. Access reports, data and news about media usage, social media, mobile, digital advertising, e-commerce, e-mail marketing, and search across a wide range of industries.
This and that
MRI+ University Internet Reporter
Search this consumer survey by the product module to find out who uses your brand and what their media consumption habits look like.
Market Share Reporter Find market share calculations published in trade news, market research reports and by trade associaitons.
Ad$Summary Reports for brand spending by media type
TESS (U.S. Trademark and Electronic Search) Find out who owns brand's trademarks.
Global New Products Database (Mintel)
Find out about the advertising agencies that make brands.
Find out about new global consumer product brands