To solve this, then, I have opened this thread where such questions can be pasted and answered. If any of you come across such questions and feel you know the answer, feel free to paste them here with your answer, but please remember to leave a link in the relevent post so that the new member can find their way here.
I shall begin with a series of questions posted today by Obsessed......
Where did Sauron come from?
Before the beginning of time, Eru, the one god, created the Valar and the Maiar. These were powerful, deity-like spirits who helped create Ea, the earth. The Maiar tended to serve the more powerful Valar but some were very powerful in their own right. Sauron was one such Maiar spirit.
What are the wizards?
The wizards are what are known as Istari. Like Sauron, they too are Maiar spirits who have been sent to Middle Earth by the Valar to help the Free People of Middle Earth combat Sauron. They are under instruction to assist the Free People, however, and are not supposed to become tyrants in their own right as Saruman eventually did. Also, so that they can better understand the hearts of Men, they have been cloaked in the flesh of old men. There are five named wizards (Saruman, Gandalf, Radagast, Alatar, and Pallando), but there may have been more.
What is Tom B.? (And his wife seems very close to nature, could she be an entwife in a changed form?)
This has been discussed at great length in the various Tom Bombadil threads, and for a full answer you are best seeking your answer there. Basically, Tolkien did not explain what Tom was, beyond that he was an "enigma". Personally I believe he was another Maiar spirit, but others have different theories, including some who feel that Tom is actually Eru.
Goldberry is said to be the River Daughter. I think she is another Maiar spirit, in this case a water spirit.
Is Mr. Willow a Heuron?
Tolkien did not say so specifically, but I believe Old Man Willow was a Huorn. He certainly had the characteristics of one.
What happened in the first age (this seems like one of the more interesting ages.)
This one really is too long for here. Two thirds of the Silmarillion are concerned with this age.
Why send Legolas on the fellowship when Glorfindel seems much more suited for the job of fighting off Nazgoul and other bag guys?
Several reasons really.
1) Glorfindel was needed for the defence of Rivendell.
2) He may have felt he had already done his bit during the first two ages.
3) Legolas represented the Wood Elves, and as they greatly outnumbered the surviving Noldor Elves, it was felt they should be involved in the affairs of Middle Earth.
4) Legolas volunteered. Glorfindel did not.