Before someone start to cry....
I know basics in GTK radiant and all I want to know is how to make mode, like with my own menu, and sound and other stuff...Or just someone please give me the adress where to find that kind of information. O, yes can someone please write diesels tutorial adress too?
http://richdiesal.jedioutcastmaps.com/tutorials/)
There are more tutorials than RIch Diesal's however, but that's the start.
I don't know about menus, I'm just a mapper :o
Menus are defined by text files under the UI folder. However, the best way for you would be to download some mods you think are great, and then unzipping the pk3s, and just studying the files of those particular mod. Examples can be much more helpful than a bunch of tutorials.
Little information about menu system:
http://www.map-center.com/modules.php?name=Forums&file=viewtopic&t=5537)
There're no tutorials telling how to make a mod like there're no tutorials describing how to make a whole game. And in many cases it's more less the same thing.
The best way to learn how to do it is to do .... exactly what like lassev just wrote.