Welcome to the board...
If you really are interested and have the time to read, you can start with this link
http://www.ncaa.org/library/rules/20...ball_rules.pdf
This is the NCAA (college) rules. There are differences for High School (NFHS)(not a ton but some) but there is no where on line to access these.
As far as the NBA, here is a link to their rules
http://www.nba.com/analysis/rules_index.html
Remeber though that the NBA exists for entertainment purposes and you will see many instances where the stars get away with things that would never fly in High School or NCAA.
Also, read as much as you can on here and feel free to ask questions. Before you know it, you may even be reffing ;-)