Enroll in a microeconomics class at your local community college or university. As well as the required material, also look at the suggested readings and references. Be active in the class and ask questions if you don't understand the concepts.
Go to the local public library and head for the economics section. Peruse the books there, and sign out the ones that you find most helpful. Ask the librarian for suggestions.
Take notes about microeconomics as you study. Jot down information you find interesting and record the citation in case you want to use later. Review your notes from time to time to refresh your memory about what you've learned about microeconomics.
Discuss the topic with your friends and see if they know anything about microeconomics and where you could find additional information. Your interest in the topic may inspire them to take a class with you. Ask them how they make their shopping decisions.
Check online resources on microeconomics. As well as researching general topics, also do searches on topics such as the "history of microeconomics," "current microeconomics theories" and "microeconomics theorists."