You are gonna get a ton of speculation. That may be what you want, but take most of what you are gonna hear with a metric ton of salt.
Not much else to add except to recommend taking a gander here and branching out:
Second Coming of Jesus Christ . Other church manuals that have sections on the Second Coming would also probably be worthwhile reads, as would of course the Book of Revelation and the various D&C sections pertaining to the subject. This is a good place to get started if you want to scripture dive:
Guide to the Scriptures: Second Coming of Jesus Christ