This is from memory, so someone please correct me if I'm off. (It's been a few months since I Blendered)
Select the entire mesh, (Select->All By Type->Mesh) then export it as a NetImmerseGamebryo.nif (File->Export->NetImmerse...)
Choose a place to save the file
Make sure the file name says .nif at the end
Click Export
At the next screen, make sure the Morrowind button is selected, as well as Smooth Inner Seams and Export Geometry.
Click OK, wait a few seconds until the screen returns to normal.
Place the mesh in your Data Files/Meshes folder, or a sub-folder within that.
and now the mesh is ready to be used in the CS.
I can't recall if I've ever used Blender for adding the texture paths to meshes, but it's really simple to do with Nifskope. (also free, just Google it)