The Addition read me that shows a bunch of mods read me does it come with the Sable dragon? When i Install the sable dragon? It says dark brotherhood armor replacer and all that is it suppose to be in it?

The additionals readme are from mods where Pluto ( the auhor of the Sable Dragon) have used some ressources ( meshes, textures, ...) for his own mod
but you don't need them to play the Sable Dragon. The only requirements to play the Sable Dragon are Tribunal and Bloodmoon.

On the other hand, the mods cited in the additional readme are quite fine and extends the pleasure of playing, they are either on http://planetelderscrolls.gamespy.com/, http://www.tesnexus.com/(all of Korana Mods are here), http://www.fliggerty.com/phpBB3/ or http://www.elricm.com/index.htm.

ALL sites and mods downloads are free, but some required a ( still ) free registration in order to download the mods.

http://www.gamesas.com/index.php?/topic/1034477-rel-the-sable-dragon/ thread is still active please use that instead.

Yes, please do. If you have a question on a specific mod, kindly attempt a search for the RELz thread and ask for help there before starting a new topic.