If you're interested in them all and you're a graphics whore, play them in order, to avoid being disappointed by the older ones' graphics, otherwise it shouldn't be necessary.

Nope. Skyrim can read your memories and if you don't have any about the other Elder Scrolls games, it won't start up for you.

I am playing it with Third person view and I find it better. You should tell people that if you plan on advertising the game to maximize sales potential.

Oh yeah I forgot about that. But third person still ain't implemented very good in Skyrim.

do you have too? no, but it would be a good idea to read a timeline of events of at least what you did in oblivion, preferably the whole series though.
however, like all games of the series if you care about the story background there are books in game, and people to talk to about the events

example, in oblvion on the streets would talk randomly about some events outside the game world, like how skooma smugglers are bringing in sugar from elsweyr