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Books
There are many great sources out there to prepare yourself for cold reading. Great books like Corinda's 13 Steps to Mentalism and dozens of web sites that give very good detailed step-by-step instructions on how to perform readings.
Before you attempt you first reading, be sure you are comfortable, and have as much information as possible, so you are as prepared as you can be.
Just entering the words "Cold Reading" into a search engine will give you plenty to go on.