how to connect sql to java netbeans6.7 for validating user detail .................

can u tel me which article to look i am a bit confused and tensed.

i am new to c# i want to develop a social web site like twitter.com with all those features of twitter,orkut..etc where can i find tutorial like books,videos etc i am a student my pocket money is not enough to survive for even a week so please i cant pay for the tutorials help me out it's the first project of my life