Trying to minimize ***spoilers:
Pre-Flashpoint Wally West is the main character. He's on the edge of existence and non-existence and he visits various people, trying to find someone to tie him down to reality. More important than his own life is the message he is trying to deliver - the true cause of Flashpoint and all of its effects is... well, Wally never names him, but it is very strongly implied to the reader that the one who caused Flashpoint is Dr. Manhattan.
Rebirth does not reboot or negate the New 52 multiverse - it gives a new (partial) explanation for why it happened.
How Rebirth is connected to Convergence: Because of Convergence, the Pre-Flashpoint Superman ended up in the regular New 52 Earth-0 universe.
How Rebirth is connected to the Darkseid War: well, um, I haven't read all of the Darkseid War yet, so I don't know. When Batman was in Metron's chair, he asked it "What it Joker's real name?" We the readers aren't told the answer, but after Batman hears the chair's response, he says "that's impossible." ***spoiler*** Rebirth tells us "there are three Jokers," which doesn't really answer the question.
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