<p>I am interested in writing static code analyzer for vb.net to see if it conforms to my company standard coding guidelines. Please advise from where i have to start.</p>

Rather than write your own static code analyzer, I recommend you use
FxCop
: and instead, write custom FxCop rules for your needs. It'll save you a lot of time.
http://www.binarycoder.net/fxcop/