Assuming that I have tons of quotes (with the authors' names) AND I intend to sell it as a quote book, do I still have to get permission from EVERY author?

Tell him you want to marry and he doesn't, so you shouldn't waste anymore of each other's time, and that you'd like to still be friends. If he is okay...

Yes. ISBN is the international standard book number. ASIN is the Amazon standard. You will typically find that books have both unless they're Kindle Direct Published, in which case they...

If the character in the story did not say the words you're quoting, then you can't quote them. That would be an unauthorized reworking of the original you are citing....

No, as long as you are not selling the book and you've correctly attributed the originators of the quotes.

Yes. Having any kind of metal in the microwave will damage it. Even if it's a small amount, it will damage the microwave over time. Please be careful as this...

No, it does not cause spine damage to the book.

Use single quotation marks around any quote within a quote, or you can also use italics, depending on the citation format and what seems most appropriate.

Use regular quotation marks around the entire quotation and then use single quotes for the quote within the quote AND for the part within that quote that already has already...

I think your best chance here would be to go ahead and shorten the quote, and after that sentence/paragraph maybe put something along the lines of "excerpt from ___" and...

Most style guides allow you to add emphasis by italicizing words in a quote. In your citation after the quote, add the phrase "emphasis added" to let your readers know...