Hi i have mostly attended cons here in California and I sign up for Adventurers League games through Warhorn and on site. How does the Adventurers League run at Gen Con?

Sign up for the events when event registration goes live.  No need for Warhorn.  Make sure you know/have your RPGA/Adventurers League number/card with you.  You'll get credit for the events you run while at Gen Con.  All of the events that Baldman Games runs at Gen Con are AL games.