Hooray! A lighter question! (I still have so many left to answer!)
To answer your first question: Yes. To answer your second question: Yes. Your third question is a little more complicated:
I believe that the Aesir and the Vanir are allies. They joined together to form the Norse pantheon. I know of at least one other person who thinks that the Aesir are cosmic thugs who abuse the poor, innocent Vanir, but I think they get along rather well. As for the elves and dwarves, there is some debate as to whether the Vanir and the elves are related, in a sense, but I see them as separate. The elves and dwarves are powerful beings, but they don’t have the power (and scope) of the gods. There are also the wights, wight may also be a term for “god”, but in modern Heathenry a wight is usually thought of as being a tutelary spirit of something (land-wights, house-wights, etc.) who are responsible for looking after a bit of land, or a house, or a river, sort of like how Greek religion had dryads, hamadryads, naiads, etc.
Apart from that, the basic concept that you have of the gods and their relationship to life, the universe, and everything is correct, but simplistic. While it is true that the Aesir are often thought of as the “gods of civilization” in some areas, they also had spheres of influence that seemed more “Vanic” in nature. Thor, for instance, was honoured in some places as the bringer of rain that fertilizes crops, whereas (particularly in Sweden) Frey was honoured for doing the same thing. While I’m on the subject of Frey, he was also said to have sired a line of Swedish kings, and “kingship” is definitely something I would put in the “civilization” category. There’s a lot of crossover between deities in that respect.
Actually, the idea that it was originally the gods vs the jotnar (and not the Aesir vs. the Vanir) was very recently put forward by a very well-respected scholar of Norse/Germanic religion, who argued that the deities known as ‘the Vanir’ were not in fact a separate group of deities. Before I forget, I should discuss the jotnar…
The Jotnar (giants) get a bad rap among those who honour the Norse gods. I would say that there are definitely some jotnar who like to destroy things and generally don’t have any interest in humans. On the other hand, half the gods wouldn’t exist if it wasn’t for the jotnar, and despite their supposed evil-ness, the gods can’t seem to stop marrying them. Apparently, male giants are evil, female giants are…well…very attractive…that said, there is a small number of people who actively worship jotnar who are not allied with the gods, but they are not looked on favourably by the Heathen community in general.
I personally don’t think that all jotnar are bad, but that doesn’t mean that I don’t believe that some just want to…smash things…