If you've not ridden fixed before 86" is plenty. Start on 42/16 and go from there - spinning is good.
Answers
1) More tolerant of bad chain line with big rings, slightly less wear
2) Yes
3) That's expensive - you can get Dura Ace sprockets for a tenner at wiggle
4) Chain whip, lock ring tool, grease. It's very easy
Go here. Read. Absorb.
@upstart started
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If you've not ridden fixed before 86" is plenty. Start on 42/16 and go from there - spinning is good.
Answers
1) More tolerant of bad chain line with big rings, slightly less wear
2) Yes
3) That's expensive - you can get Dura Ace sprockets for a tenner at wiggle
4) Chain whip, lock ring tool, grease. It's very easy
Go here. Read. Absorb.