I just bought Sonar X3 & I really need to learn how to create my own customized drum track beats. Does anybody have any links on how to do that.

Try using the step sequencer. You have to learn to create the beats by yourself but using the step sequencer will help you along the way.

Welcome to te forum!
Take any beat and customize it in Piano Roll. Or record your own beats with a MIDI keyboard, or by drawing them in the PRV or using the Step Sequencer.
You do know how to use the drum VSTs?

Try this link to Tweakheadz site.  There is a lot of useful info there on home recording.  This article is specific to programing drums.
 
http://tweakheadz.com/how-to-make-original-drum-tracks/

The easiest way for me to create drum beats was by using a MIDI controller like the V-drums. But to each their own as what is easy for me not be easy for you. 

It may help if we know the style of drum track you are trying to make.  The way you would go about creating drum tracks for  Metal solo,a southern rap style trap beat and a UK style Drum and Bass are very different.

Here's an article I wrote about another approach to creating beats.

Dubdisciple: I would like to make a metal beat. Something easy to start off with.

Your opening post leaves so much question marks howering.
Are you familiar with using drum VSTs which means studying the basic use of SONAR? If you are, what prevents you from doing your own beats, i.e. what is the specific question?
Just "tell me how to make metal drum beats" sounds like, "please, copy paste all the drum VST and SONAR manuals and help files for me".

The best suggestion is to listen to songs that are in the style you want to create and identify what is going on with the drums.
 
Figure out what is going on with the kick and then program it into the step sequencer or PRV.  Figure out what is going on with the snare, program it into the step sequencer.  Same for hi-hat, toms, cymbals, etc.
 
Often times if I am try to emulate a certain style, I have iTunes running and I listen very carefully to a song (often over and over again, rewinding specific parts) to ascertain the drum pattern.  I do the same for bass if I find a rhythm pattern I like.
 
its a lot of work.  Unless you just want to use canned loops from the internet or one of the drum sequencer add-on packs, you're going to have to spend the time and effort to understand how drums are played to get a realistic sounding drum track.