Answering "How much training do you need to be a song writer?"
You need talent. Having some musical training would be very helpful.
yes
Yes, to post a song you need permission from the song's writer and/or performer.
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If he is a writer then he writes whole song :) it depends how creative he is
Regardless of whether or not the single is number one, the song writer usually earns 50% of the royalties.
The song writer was Taylor Swift.
First you need to write a song ,record it and put it on a cd. Then you need to find a producer. If he /she likes it, they could make you a star
no set amount; depends on the marketability of the songs
He is both a song writer and a singer.
Micheal Jackson of course he is a great song writer but he raped kids
Depends on the level of profession. If you want a song played everywhere, known by everyone, dream on.