They had several reviews and articles on the film. A lot of hype and discussion, as I recall. I also had several different books, the novelization and all the toys I could get my hands on (looking at Ebay makes me sad now).
Don't blame you. I managed to get a slightly used copy of the original hardcover TMP novelization for about a couple bucks (and even then I think I might've had a coupon that netted it for free.
Kind of.
Yeah, I'm not sure. It seems like with TMP, at least, it was initially received reasonably well (not the Second Coming that the fan hype was expecting, but a fun day at the theaters). Then, somewhere along the line, it became a movie you were supposed to hate, and I'm not really sure how that happened, esp. since to this day, while not the best of the series, I still can't find anything wrong with it.
Mechanical things that she seems to have a knack for, I don't necessarily relate to as Force based. versus overt use of Force powers such as resisting Kylo's mind probe, persuasion and in combat.
As for relevancy, I think its a matter of distinction. Some skills appear to be very natural or stuff they learned in their environment while matters feel more like they are intuitive to them and only come o ut as they developed a greater awareness of the Force.
TFA lines up quite a few Chekov's guns for Rey. (People who complain about her wining the duel at the end should re-watch the movie closely and pay attention. Everything to set that up is there, the movie just trusts that it doesn't have to spoon-feed everything to the audience.)
As far as Force abilities go, there are a lot of instances where Force-sensitives have been shown to do things untrained, so I was never bothered with this (esp. since canon has linked the mind trick -- the hardest to explain -- with Rey building off of what happened when Kylo Ren was mind-probing her).