Someone told me that reading "The Shelcoders Handbook" or "HAcking: The  Art of explatation" can get me started, so I am doing that... but if you want to read something online you can start with:

http://insecure.org/stf/smashstack.html

cheers

Welcome to the forums, goku12205.

What exactly do you mean by finding vulnerabilities? Do you mean it in the way that you know for example how to crash a certain program and would like to know if you can exploit it actually in this way (e.g. bufferoverflow), or that you find vuln. while scanning a network with tools such as nmap?

If you are interested in writing exploits on your own it might be quite hard, depending on your skills so far. There are a couple of books available which focuses on exploits and may interest you:

Writing Security Tools and Exploits
Hacking: The Art of Exploitation, 2nd Edition
Chained Exploits: Advanced Hacking Attacks from Start to Finish
Sockets, Shellcode, Porting, and Coding: Reverse Engineering Exploits and Tool Coding for Security Professionals
The Shellcoder's Handbook: Discovering and Exploiting Security Holes

Smashing the Stack for fun and profit linked by celord is certainly worth a read too.

If you are more interested in the second scenario, using existing exploits for known vulnerabilities, I would recommend to play around with Metasploit in your own lab.

Thank You Everyone for ur good advice and i really apperchate the information thank you again

My best regards to everyone