hmm..usually the first thing you should do is to do a formal greeting.
Do not be too casual.
A nice good morning, afternoon would be much more appropriate.

When you're being interviewed, answer the questions firmly. Do not shake your legs, it pretty much disgust certain people and don't move your finger playing about. All this potrays your being and even though it got nothing to do with your capabilities, a first impression always should be good.

usually whenever they always pop this question , "tell me abt yourself stuff", is best to start with ur education line if you're a fresh grad. Then talk a bit about what you've been doing these while, etc, job, projects, your characteristics and past working experience which may enhance your probability to secure the job. Don't need to brag too much.

The question what do you see yourself in 5 years, I used to answer that with, "Well, personally if there is opportunity in the company to progress, I will see myself as one of the contributing factors for the company while moving up the organizational chart." The interviewer would be like, "WTF"....hahaha