The only way to make it work in the long term is to be yourself, so just do that and he'll either like you as you are or save you the trouble of trying to pretend you're someone you're not.
Please give us more details. What exactly has he done to show interest. Also, tell us the environment. Example, he is a classmate, a neighbor, someone you met at a bar, etc.
easy...show interest back. Look him in the eye and smile. Say that you'd like to talk with him when you are both free. Do fun stuff together so you'll build history together you can talk about. Touch him gently on the shoulder or arm...an innocent touch. Guys love to be approached but not to forcefully as throwing yourself on him could be taken the wrong way.
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