I've been in over 6 amateur boxing tournaments, I will tell you this. Don't over think it, treat it like a spar. Since you're grappling? get 3 moves for each position as your go to. It will make your anxiety on your first go around easier to handle. 3 for standing, 3 for top, 3 from bottom.
Have fun enjoy it, learn what you can do better after you take an honest assessment of how you faired.
GOODLUCK!! @
veritas, just enjoy yourself =)