How could a PhD holder file for a Self-Petition such as a National interest Waiver - Category "EB2"? and how long does it take ?

It depends on what country you are from first of all For more info on the...

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I am in US on L1 visa & want to bring in my wife to US on L2 or B2 visa.

Not on L-2

My F1 Visa to USA was rejected.

My Colleague is correct. a third part consulate doe s no t have to accept you case, especially since you have been denied once. Forum shopping is...

Would extreme DUI result in denying naturalization/citizenship?

Depends on how your local office perceives this issue. Hire a local attorney to review your case

Can one obtain a green card under the dream act after removal proceedings have begun?

The Dream Act did not pass and it is not offering a green card For more info on deferred action, see link below. Hire a lawyer .. not a notario...

I am on employment EAD and i do have a Valid H1B/797 till April 2015 but not stamped yet. and i don't want to use H1B anymore.

Do you have advanced parole?

How long i-130 case takes for over 18 Brother or sister ?

Depends on country of birth.. but 10-20 is an accurate estimate

If I work for a Canadian company on a work visa and the parent company is located in the USA can I be transferred on a L-1 Visa?

You do not need to be a Canadian citizen For more info please see http://immigrate2usa.com/practiceareas/non-immigrant-visas/l-1-visa.asp

Form I-130 was approved for both of my siblings. The priority date is March 13, 2012. When do they need to submit form I-485?

Likely when their priority date becomes current in about 10-20 years.. no joke

How much does a lawyer in immigration cost generally? Involving either a K-1 visa or a K-3 visa?

IT is impossible to say for sure, I have seen as little as $500 and more than $5000 you should call around.. that is what most people do...