This is what you need to get to NATS:
-NATS in the US is hosted in a large game fair called the ORGINS GAME FAIR. This game fair requires a ticket, which costs $30 for SAT/SUN of the NATS week, and $60 for WED-SUN of NATS week.
-If you win states or place 2nd, you get a free ticket ($60 value) to orgins, which gets you into Nats.
-You really only need to get to Nats, pay for a ticket, and register a deck to play, which I did last year. It is easy. Preorder your ticket. It will guarentee a spot for you.
Hope I helped. PS: Same with Regionals, States, NATS, and Worlds...except worlds you need to get in by placing high at NATS, get an invitation by high K points, or get high in grinders; the last chance to get into worlds.