It's entirely the grooms' choice. Straight men do not have to wear tuxedos and neither do gay men.
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Traditionally, men wear a suit and tie on their wedding day. Depending on the formality of the event, the groom might wear anything from a tuxedo to a shirt and slacks.
In some States marriages between same sex males is not recognized, but the two men are just as in love as if it were a relationship between a man and a woman and therefore the gay men wear their wedding bands because they feel they are married.
No, he doesn't wear his wedding band until after the wedding.
Yes!
Same as a straight man, on the left ring finger. But it can also be on any hand or finger he prefers. (It's not like there's a law that you have to wear a wedding ring on a certain finger.)
If you are a woman or man and wear your hair to the left you are indeed gay.
Yes.
Generally a single man that wears a wedding band (usually on the right hand) does so because it may have been his fathers or his mothers wedding band.) There may be the odd single man that is shy and it a way that he can excuse himself if caught in an awkward position if a woman comes onto him. Some men may be gay and although in some States gay marriages are not acceptable the couple feel they are married so they wear wedding bands.
To show the love and fidelity that you have for your husband/wife.
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The right