Rinse the new bottles first, just to get any dust out of them. Then use 1oz. Star-San per 5 gallons of water in whatever container you feel like. Soak them for a minute and pour out. It's good to have a bottle tree (also sanitized) to set the bottles on.
I made a raspberry wheat extract kit from Annapolis Homebrew that came with 3lbs of pasteurized raspberry puree. I split the batch and added the flavoring extract to half of it. Overall, the real fruit tastes better and doesnt give any weird aftertaste on the finish. You can buy all types...