I assume, you already know the first steps...
1. create a directory called "Maps" inside your Morrowind directory
2. open the Morrowind.ini file, and set
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Create Maps Enable=2
3. start the Morrowind launcher, select the mods, you want to generate the Maps of (I would de-select the others, the createmaps function then takes less time to run). Then start Morrowind
4. Start a new game (AFAIK, it runs faster on new games) and after entering the name of your character, open the console, and type
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createmaps "yourMod.esp"
After the first cell is loaded, close the console and wait, until all cells are processed. The function first processes all the cells of Morrowind.esm, including the interior ones. Then, it maps all the loaded plug-ins, not only the one, you specified in your command. - so don't quit, if interior cells are processed, just wait, until it stops loading any cells. This process takes some time, about 1.5 hours on my machine.
5. Exit Morrowind, the pieces of the map should be inside the Maps directory.