1. And God said: O Mankind! Be dutiful to your Lord, Who created you from a single person (Adam) and from Him (Adam) He created his wife (Eve), and from them both He created many men and women. (Quran 4:1)
2. God said to Adam after Adam ate from what was forbidden to him:
Get you down (upon the earth), all of you together, from Paradise, some of you are an enemy to some others. Then, if there comes to you guidance from Me, whoever follows My Guidance shall neither go astray, nor fall into distress and misery. (Quran 20:123)
So being Muslim, I believe that Eden is in Paradise.
3. God doesn't lead you into sin. You lead yourself into sin. It's just that God knows what sins you will accumulate in your lifetime because He is All-Knowing.
4. I believe that God is capable of anything, so He could make it that a piece of fruit, or even a piece of a piece of fruit could grant you much, much more than just knowledge. It is easy for Him who just says "BE" and it is.
5. Some parts of the Quran are written very poetically and you can get confused about it's meaning, but what's nice about the Quran is that there are Hadiths which show you the proper meaning of certain things that you are unsure of. And there are also many things repeated in the Quran using a different approach, yet meaning the same thing, so you really get to know what is being said by the Lord.