How should i prepare for my first tournament?

Take it easy. Do some putting or light hitting on the range for the next few days. But don't worry about your game or swing, just trust it. Your not playing the other golfers, your playing the course. So don't worry about how they are doing. Just go out play your game and play the course. When I played in tournaments I used to close my eyes while other guys where hitting, or I would only think about the layout of the hole I was on. The biggest thing is staying calm and relaxed. Good Luck.