You learn ucLinux in the same way as you learn any system - get a book, read some website tutorials, go on a course, buy a demo board, find someone nearby to whom you can talk.
People in newsgroups or online forums can help, but only if you have specific questions. How would you (Siva) react if someone said "I want to move to Mumbai. I already like curry - how do I speak Hindi"? If you want people to spend time helping you, you must first demonstrate that you have made an appropriate effort yourself by, and you must learn to post correctly - most Usenet readers understand that English is not everyone's native language, but have very low tolerance for SMS abbreviations, lack of capitals, stupid spelling mistakes (use a proper newsreader, or at least a browser with a spell checker), and top-posting.
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