Your ideas on this !

[desert fox]

i decided to be a good webmaster in the sense finding out correct vulnerablities and problems and patching it out on the correct time make sure my clients are safe.so which place can i start even i am trying to be creative as possible give me your ideas.your suggestion is what i need

Regards,
Desert fox <3<3<3

 

[Phogo]

Set up a local sand box enviroment, play with some pen testing software, install scripts and try and break in

 

[DarrenK2]

I suggest you start with securing PHP:

http://www.phpfreaks.com/tutorial/php-security
http://security.stackexchange.com/questions/1382/disable-insecure-dangerous-php-functions