Hi there Ulf, welcome to the Guild! Well there are several methods for making mountains, and which method you choose will depend upon the style of map you are going for. If you are interested in a more photorealist map, such as you would get from FT 3, then using a cloud pattern is probably your best bet. However, the disadvantage of working with cloud patterns is a lack of control of the general shape of the fractal pattern, meaning it is more difficult to generate the sorts of mountain shapes you need where you need them. There are a few methods I'm aware of for trying to bypass this. The first is the cut & paste method discussed by Ascension in his Atlas tutorial (I also use this method in my Eriond tutorial). Another is RobA's method which involves rendering clouds and noise in selected areas. Finally, there are some Photoshop specific methods for rendering mountains (that don't involve fractal clouds) through a process of using brush presets (e.g. bevel & emboss and pattern overlay) to "paint" in mountain areas. Pasis discusses this in his Mountain Creation Tutorial as does Tear in his Saedran tutorial. Spend some time in the tutorial section and you may find other methods that work for you as well.

Cheers,
-Arsheesh