where is the original place that redguards come from?
i know that they are in hammerfell but did they where in other place before that?

They are from the continent of Yokuda, which is now under water.

http://www.uesp.net/wiki/Lore:Yokuda

They came from Yokuda, as previously mentioned.

Yokuda is a continent west of Tamriel. Redguard is a corruption of the word/political party(?) Ra'Gada.

The Raga left Yokuda either due to a bad political situation, or because their Ansei (magic samurai basically) blew it up with nuclear fission.

Yokuda. They sunk it by being awesome with swords and stuff.

Ra'Gada was the original warrior wave who left first and became the forebears, and everyone else who took longer making the trip became known as the crowns. Since the originals were Ra Gada, every Yokudan immigrant became known as Redguard, the corruption of Ra'Gada.

The redguards hail from the lands of Narnia, where their commander Azlon sits atop the throne and commands his legions in the pursuit of catnip and milk.

But in all seriousness, redguards are from Yokuda. Look it up on UESP if you're interested.

Because the imperial library isn't [censored].

The important parts are left-handed elves and being so good at sword-fighting they caused nuclear explosions.