The official Paizo Blog is the link at the top of the message boards (Paizo Blog). You can also filter for just posts specifically related to PFS by looking at the Pathfinder Society tag. Yes, it looks like a lot of posts, but most of them are announcements of new scenarios, etc. and not rules related. Individual products might have specific errata. The errata documents for individual products are available under PFRPG Resources. The Pathfinder Reference Document should be up-to-date with this errata.
As far as I know, what you have listed is the sum total of PFS official rules clarifications, but I am not entirely sure. The sticky threads on these boards have pointers to relevant rulings, but those should be replicated in the FAQ.
As a new GM, I wouldn't worry about learning every detail of the official rules clarifications. You only have to be responsible for the scenario and monsters you're running and the general rules. Keeping track of every single rule is just an infeasible plan. Since players are required to bring the resources they are using for their characters, if something doesn't make sense to you, you can ask to see how they managed it.