This is my understanding of what happened in the Garden of Eden.
Genesis1:1-30, God creates the world, animals, plants, man.
vs. 31a "God saw all that He had made, and it was very good."
vs.27a "God created man in His own image" , and God is perfect, so when God created man he was perfect, but he also gave man free will.
Genesis 2:16-17, "God says, 'you can eat from any tree, besides that of the knowledge of good and evil, for if you eat of it you will surely die
Genesis 3:1-3, "The crafty serpent asks Eve if God really said 'don't eat from any tree' and Eve replies that 'we can eat from any, except of that in the middle of the garden, or we will surely die'
Genesis 3:4-5, "The serpent says 'you will not surely die
. For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil.'"
So God created a perfect world, with man and woman where conditions for them are perfect, and they are perfect, with the potential to remain perfect if they follow God's direction (God being perfect).
When God said "you will surely die", he meant spiritual death, separation from God, which is the definition of sin.
When the serpent said "you will not surely die", he meant you will not die a physical death. But he also said "you will be like God, knowing good and evil", which is affirmation that disobeying God would result in evil, because until then there was none in the world.
What Satan did was tempt with the promise that they would be like God, he lied to them and he deceived them.
Through out the Bible Satan is meantioned as the temptor, the liar, the deceiver. But he is also refered to indirectly any time there is mention of opposition to God. Not like he is behind every sin, but that he works to promote sin, whereas God works to promotes righteousness.
There is a lot of mention of Satan in the new testament, in the form of letters from the apostle Paul, who is writting to new believers to explain to them the deeper truths of God. You might find it interesting to read through. Here are some passages from the last few books before Revelation, not written by PAul
James 1:13-18 ... we are tempted when we look to the world for answers
James 3:13-18 ... wisdom from the devil, wisdom from God
1 Peter 5:8,9a ...your enemy prowls, looking for someone to devour
1 John 2:9-11 ...God is light, Satan darkness
1 John 2:15-17 ... World is temporary, things from God, eternal
1 John 4 ... knowing a spirit from God, or from falsehood (vs 1 "false prophets" can also be read "prophets of falsehood")
1 John 5:19 ...world under the control of the evil one
2 Peter 2 ...false teachers and ther destruction
2 Peter 3 ... "the day of the Lord"
These two you will find helpful to read before you read Revelation, as the book of Revelation can be VERY confusing.
Some people think Revelation is metaphorical, others think it is literal. Either way, it is about the "end times", or the "day of the Lord", when God will force people to either choose Him or choose wickedness.
Author Tim LaHaye has studies prophesy for 50 years and does a lot of study/talks/writting on the end times. A very good one is called Are We Living in the End Times?
By Tim LaHaye and Jerry Jenkins
It explains what all the seals and trumpets, vials, and has a time chart.
Hope this helps in some way