Really good attitude bro and the biggest tip I can have honestly is.
"Don't care what people think about your play and have fun."
I mean obviously you want to win; who doesn't? But the fact is tournaments are just alot of fun because of the community aspect of things. I personally believe if you keep this in mind, you'll be alot less nervous when you're playing on the big screen. Honestly everyone would just be happy to have another tournament player. I have some nerve issues and when I go to my first tournament here in a month, I know I may have to deal with them. But honestly? Just have alot of fun bro and meet cool people.
Welcome to the site. We're happy to have you, and goodluck.