Isn't it what God Himself has to say on any subject what Really Matters? Not what anyone else claims -- not even people who claim to serve & have a close relationship with Him? So, let's consult Him by reading what he's had recorded for us in his word. These articles thoroughly cover the questions you've asked, and more:
1a.
What Has Happened to Hellfire?
~ ~ A Brief History of Hellfire
~ What Really Is Hell? http://www.watchtower.org/library/w/2002/7/15/article_01.htm
1b.
The Hereafter--Where Will It Be?
~ Earth--Just a Testing Ground?
~ Eternal Happiness - In Heaven or on Earth? http://www.watchtower.org/library/w/2000/10/1/article_01.htm
2a.
Is There Any Hope of Salvation?
~ Jesus Saves - How?
http://www.watchtower.org/library/w/2001/11/15/article_01.htm
2b.
Have You Been Saved?
http://www.watchtower.org/library/w/1996/2/1/have_you_been_saved.htm
~ What We Must Do to Be Saved < < < < < < < < <
3. Select: The Wonderful Gift of Free Will link#4.
Does God Really Care About Us? :
~ An Earth Free From Suffering
~ How We Can Know There Is a God
~ God Informs Us About His Purposes
~ The Wonderful Gift of Free Will < < < < < < < <
~ Why God Has Permitted Suffering
~ What Has Been the Result of Rebellion?
~ God's Purpose Moves Toward Fulfillment
~ How We Know We Are in "the Last Days"
~ The Marvelous New World of God's Making
~ The New World's Foundation Now Being Laid
http://www.watchtower.org/library/dg/index.htm
4.Where we can find accurate answers to our questions.
True Teachings--Where Can You Find Them?
~ True Teachings That Please God:
~ ~ How Old Is [the Bible?
~ ~ How Is It Organized?
~ ~ Can You Trust the Bible?
~ ~ What Does the Bible Teach Us?
~ ~ What Will You Do?
http://www.watchtower.org/library/w/2005/7/15/article_01.htm
"Make Sure of All things; Hold Fast to what is Fine!" 1Th5:21
Rather than asking various people's opinions, aren't we wise to seek God's answers?