If you consider The Hobbit “wordy”, Lord Of The Rings may not be for you, and you really should stay away from The Silmarillion…
For me, LOTR, followed by TH, was my first introduction to the world of fantasy literature when I read it as a teenager. For that reason, I could overlook its flaws, and whenever I read any other fantasy novel after that I would recognize its debt to Tolkien. When you read Tolkien after already being familiar with later fantasy works, the experience might be quite different.
No, that’s quite specific to TH, which was intended as a children’s book. In fact, I think I read somewhere that Tolkien himself got fed up with that particular literary technique as he was writing the book, and removed most instances of it, but a few stayed in.
TH and LOTR were intended as a deliberate creation of a mythology for Great-Britain, along the same lines as the Greek and Teutonic mythologies. You could think of the books as having been written by a literary researcher, perhaps Tolkien himself, who had access to the various materials written during and after the time in which the story takes place, and who sifted through all that material, extracted a coherent story from it, and presented it in a form suitable for modern readers.
That is definitely Tolkien’s greatest strength: his ability to evoke the feeling that Middle-Earth is this enormous, real, complex world containing so many different things, some of which play a major role in the story while others are mentioned only briefly – and undoubtedly, a thousand other things which exist but do not get mentioned in the books because they are not relevant to the story.
I’m pretty sure that the Necromancer was supposed to be (or was later retconned to be) an early incarnation of Sauron, who had not gained his full strength yet. I believe this is mentioned in The Silmarillion, but it’s not obvious from LOTR. When Tolkien was writing TH, the Necromancer was nothing more than a minor villain, an excuse for Gandalf to let Bilbo and the Dwarfs fend for themselves for a while, and a way to give some extra depth to the fantasy world.
Maybe not the same individual birds, but probably the same group I would think.