Thanks everyone for your comments.
cjay, This is a starter's guide to sql injection, it doesn't work "as is", though, if you check out the other sites, especially
SQL Injection Cheatsheet, you may find something useful, and yes, sometimes it works, I 've had access to l2 accs. Search in russian sites google: sql injection l2 cp. Too bad you need to work with a translator, unless you know Russian. Advanced sql injection walkthroughs: check the sites given in 1st post. Advanced sql injection is very powerful weapon. You can watch some videos Lostos is inactive because some members of MxB are damn motherfuckers. No more guides/shares from me.
I also hacked my school site.
Have fun!