I am recently getting into the modding area of morrowind and I want to go about re-texturing vanilla morrowind or replace ones I have got from existing modders. I do not know how to replace the texture with my own nor which file type to save them at or locations etc. I need a link to a tutorial or some hefty guidance in terms on how to do this step by step.

Any help will be most appreciated

Once you know the name of a texture used in the original Morrowind, you can just put a texture file of the same name into your "Morrowind\Data Files\Textures" folder and Morrowind will automatically use the new texture instead of the one from the original game.

The game's texture files can all be found on the Construction Set CD if you want to edit one.

If you don't know the name of the texture you want to edit, but you know which model uses that texture (for instance, you don't know the name of a particular Hlaalu texture but you know that it's used by a certain model), you can find out the name of the texture by opening up the model in a program like NifSkope.

If you don't know the name of the model either, you can open up the Construction Set and find the object that you're looking for; double-click on it, and it will say what model it uses. Then you can find the model, and then you can find the texture

Sorry, not exactly "hefty" guidance but hopefully it will give you an idea of what you need to do. Once you know the name of the texture you want to replace it's actually very simple

http://www.zyworld.com/redwoodtreesprite/FreeGraphicPrograms.htm

Thank you all and where do you find the textures from within the construction set, I am new to all this obviously

...
You can read, though, can't you?

That was a bit harsh JackPot. I'm sure he can read, and I imagine it was a mere misunderstanding.

Are you looking for a particular texture?

Sometimes you can find them just by looking through the texture folder. For instance, armour textures generally start with "tx_a_...", weapons generally start with "tx_w_..." and clothing generally starts with "tx_c_...". Or you can just run a search for keywords like "metal" or "wood" if you're looking for a texture along those lines.