The fun begins at 8am, and will go on until March 30th. If past patterns come into play, then most of the filers will show up on the first or last days.
People who file today get a random number and the order is drawn out of those filers for the first spot. Then everybody else gets a spot as they show up. (Slightly more fair than the new Jackson County system, where you sign up for a spot on Monday and it’s done in order then. Until the mid-1990s, I believe the statewide system involved having people stand in line for you for a few weeks and no random numbers.)
More information is here.
Betting for who files first should acknowledge who is a legislator (or works in the Capitol).
So post interesting stuff you find here. And the updates will show up in the other 26ish days that filing is open.