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Not loud, not talkative, not overly friendly. But make sure that everyone in school has at least heard your voice once. Whether it was when you asked a question in class or said "sorry, Excuse me" when you bumped into someone, make sure you use your voice. Don't talk when you're not comfortable, but if you think you can add something to the conversation, just open up and say it. Another thing you want to do, is talk more when people usually talk less, and talk less when people usually talk more. For example, if you crash into someone else, most people would just say "Sorry" or "Excuse me" and continue moving. You ought to extend that. Say something like "Oh, I'm so sorry, are you alright?". When people are asked something like "Do you have any plans over the weekend?", the average person will launch into a long detailed explanation of what they are doing and why and invite anyone else to come along. With something like that be brief. The purpose of this is to make your reactions out of the ordinary. They are more likely to remember you if you stand out, even if it's something as small as the length of your sentence.