How do I "register" for them so I'm guaranteed a spot?
Welcome to Shadowrun! You can register for the Shadowrun Missions at Game Day by logging into Warhorn and then 'Signing up' for the next game. I just posted the next game for March 16 (don't sign up for Feb 16! It's done already!).
Be advised that this site will be taken down at the end of this month as we move our focus to the meetup site.
If you have more questions, I can be contacted at:
Snowfrost571 AT Yahoo DOT com
-Perry SnowVegas Game Day Organizer