Tamriel Rebuilt

Try NIFscope, download some tutorials for it too. It can be pretty bloody complicated otherwise.

Make sure it's tga or dds, the resolution is a power of two(256x256;512x512) and you have a UVW applied.

Download a Blender tutorial that tells you how to export textures.

I was kinda lazy in my last post so there's the best place where you can answer your questions.

http://www.niftools.org/wiki/index.php/Category:Tutorials

Probably your normals are flipped. Select all the faces in edit mode and press CTRL+N.

If it is only some of your faces, you'll probably need to go through them.

In the attached image, you see on the left an opaque face. This one is where the normal is facing towards me, so I will be able to see the texture from this side, but not the other. The one on the right is with the normal reversed, so I will not be able to see the texture from this side, but can from the other. Basically, you want to flip all the normals that have transparent surfaces when you are on the outside of the model.

Well, the attached image would be attached, if I could attach an image. Err... Help?

Image hosted on [url=http://www.filefront.com/]FileFront[/url]
[img]http://static.filefront.com/images/personal/t/TomAV/47081/cmizxvgucf.jpg[/img]

'clear texture'? do you mean a transparent one?

the mesh has to have a transparency value i believe. so as far as i know, u can either use transparent .tga textures (not sure if .tga works with Oblivion though) or full .dds textures on a transparent mesh. beyond that ive no idea hope it helps

You need an alpha map- bsically another texture that you add that determines the see through-ness of the actual texture. Dont remember the exact steps to take in blender, though.

on the UV window buttons there is a alpha map button.