|Jason Schimmel RPG Superstar 2010 Top 16|
1) They are available under the community use packages as a bundle called Starfinder Society Pregrens
2) The Pathfinder Society Page will probably have a landing page for reporting SFS events as well. You Create apage for your event there and at the end of the event you type in the information including you player number (as the GM) and the numbers of your other players.
3) Your pace will quickly outstrip the available material unless you different games have unique players there are currently 5 scenarios available and one AP volume (which is good for 2-4 sessions depending on how it is run.)
They are only releasing 1 new scenario a month and I think AP volume are every other month.
Consider frequently rerunning the quest pack and 1-01 since both are playable. Keep an eye on the product pages so you know what scenarios are coming up and their level range.