Do you know where the opening melody was stolen from?
The claim was that it was stolen from a song called "Taurus" for a musician named Randy Wolfe.  My personal opinion is that they do not sound that similar.
Do you think it ruins the song for you knowing part of it could have been stolen? I personally think its a great song either way :)
I feel the same way.  I think Led Zeppelin performs it so well that I do not really care if it was stolen or not.  But my opinion is that it was not stolen, anyway.
I think it takes alot of talent and work to make it sound as amazing as they did so either way people shouldn't care. I'm glad we can agree :). Do you have any songs you would recommend someone getting into Led Zeppelin
The other Led Zeppelin songs I favor are Kashmir, Immigrant Song (not offensive, it is about Viking warfare), and Dazed and Confused.  I think Stairway to Heaven stands above them all though.
How do you feel about bands that cover songs from popular musicians?
It is all about the quality to me, I enjoy bands that produce cover songs and do not look at them as if they are "stealing".  One example is a musician named "Little V" who produced a cover of Bonnie Tyler's "I need a hero".  I feel like Little V's version is actually somewhat better than the original, but that just might be me favoring the more Heavy Metal tone he puts on that song.
I agree honestly lol. How long have you been listening to Led Zeppelin if you don't mind me asking?
I have been listening for about Ten years.  The way I found them is actually kind of interesting, as I kind of inadvertently found them through a YouTube video.  I used to be in to comics more than music, so I would watch these YouTube videos with DC comics set to a musical score.  One of these videos happened to set a Batman comic to Stairway to Heaven, and I have been listening to them ever since.  
Haha. I wish we could talk more we have some similarities
Same.  It was nice meeting you and talking about Led Zeppelin with you.