When Ultron created Vision he just conveniently had that infinity stone to bring the guy to sentience?
As stated, he made a point of taking the scepter when he left Avengers Tower (see below).
And how did he even know what an infinity stone was?
Because he was created by it - Banner and Stark used what they understood of the "AI" in the scepter (aka the mind stone) to create Ultron.
He got all his knowledge from watching the files that Tony Stark had in the knowledge base
Not exactly, he absolutely assimilated all that knowledge and then some but that's not all he knew. He came in with at least some knowledge of the mind stone as well - how much is unclear.
but so far do any of the Avengers know that Thanos is coming to collect these stones and what they are used for? I know we (the viewers) know but do the characters in the movie itself know?
All the Avengers (mostly Thor) knows:
1. The Tesseract is powerful and ancient - it's unclear when Thor knew it was an infinity stone and when he told the rest of the Avengers.
2. The Aether resurfaced in Thor2 - Thor clearly knew this was an Infinity Stone, at least by the end of the film (post-credit scene). At this point (if not before) he also knows the Tesseract is/contains one.
3. It seems that Thor has heard of the events of GOTG in some respect - since we know they're in contact with the Collector this makes sense. Though it is possible he first learns of this in his vision.
4. I think it's highly unlikely that Thor (or anyone other than Loki) realized the scepter held the Mind Stone or else there's no way Thor leaves it with Stark/Banner to poke at. But his vision reveals that to him.
5. Lastly, nobody seems to know that Thanos is involved (I suppose Loki never revealed who gave him the scepter). All Thor suspects is that the four stones showing up must mean someone is doing something. Or even if someone isn't, someone will soon as the stones are going to draw attention.
6. Thor (through Odin if nothing else) will know what the stones can do for the most part and we can assume he'll relate to the Avengers.
Reading my signature constitutes admission that I am correct. (Too late)
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