Beleriand was huge....it includes Ered Luin and everything west of it till the shores of Great Sea Belegaer....but since it sunk after the last war, its difficult to put it in estimate....
The Men of Westernesse were a long lived race by themselves, blessed to be so by the Valar....and when they arrived to Middle Earth, they were a large number still, enough to occupy and form two huge kingdoms of Arnor and Gondor....so the mingling of normal blood was slow....obviously it did happen over time, but there were many who were still purely numenorian....As for the House of Numenor, they came to acquire long life from being around elves and learning from them so much, So when Elindil fled Numenor taking some people with him, did the blood kind of, lose its potency as they bred with normal men and no longer had contact with the Elves?
Arnor was the entire north kingdom of the dunadan....Gondor was the south kingdom....Arnor included all of Eriador, right from the River Lune to the Bruinen.....its capital was the city of Annuminas founded by Elendil himself.....it later got divided into 3 parts Arthedain, Cardolan and Rhudaur.....the capital of Arthedain, the biggest and most powerful of the three, was Fornost.....but then many wars took place and much happened.....and the great kingdom of Arnor fell when the Witch King successfully captured it....the final Battle of Fornost did free it from the Witch King's rule and he fled, but Fornost was ruined and the North Kingdom was mostly deserted, the people dispersed.....the Rangers (including Aragorn) were mostly people of that kingdom living in exile...I saw someone listed Aragorn and Arwen being lords over the reunited kingdoms of Anor and Gondor, what/where was Arnor? The mention I've seen of it was in the Northdowns in game.
After the Battle of Fornost (TA 1975) it lay deserted until the War of the Ring and the destruction of the One Ring and Sauron....Aragorn then took the throne of Gondor as well as Arnor which was rightfully his and in later years after the events of the Lord of the Rings rebuilt even the North Kingdom, though not many details of that are given except in the epilogues of the Return of the King.....
Lol dunno what wings you meant, so I'll skip that one....Why do people argue so hottly over whether or not have wings?
Big question here:
What exactly was Tom Bombadil?
reading on the Wiki about how lesser creatures would turn invisible with the One Ring, but greater people could become invincible. I know that Tom didn't turn invisible, so would it have made him more powerful than he already was?
Tom Bombadil's origin and everything is left a complete mystery.....the Professor himself said so in one of his letters iirc....only the bits and pieces we find in the Lord of the Rings and other works is what leads to guessing he was one of the very early creature (or person but since his race is not defined either, we'll leave it at that) to walk middle earth....he recalls the wars of the northern kingdom and even says he knows the shadow of the night when it was fearless.....before the terror came....so that means he was already there before Sauron came to middle earth.....or if we consider Morgoth to be that, even before that.... O.o but there is no proof, no data....