I want to know if I can buy round trip or one way ticket for my mom after she received her immigrant visa?

Congratulations. Either option has no immigration consequence.

L2 EAD to H1B Visa

I agree with my colleagues. Your spouse need to maintain his L1 status until 9/30/2013 in order for you to stay in the U.S.

Applying for adjustment of permanent resident status

As a spouse of a U.S. citizen, you are allowed to stay in the U.S. and adjust your status after you file the applications. You should worry about...

Entered on a tourist visa for a two week holiday to visit my girlfriend but we ended up marrying, how do i now stay???

If your spouse is a U.S. citizen, she can file I-130, I-485, and other required forms for you.

Aciddently claimed us citizenship on i-9 form didn't read the form right.

USCIS can check your I-9 record. It could affect your AOS application because false claim to U.S. Citizenship can render you inadmissible.

I am currently on H1B visa with company A, company B filed EB2 for me. I already received EAD/AP but my I140 is still pending.

You should wait until USCIS approve your I-140. Also, you would like to maintain your H-1B until USCIS approve your I-485.

I am filing I-485 form to adjust Permanent Residence

I agree with my colleagues. Even if you send the applications after September 1, 2012, you are still allowed to stay in the U.S. during the review...

245I Inquiry

Did the 2001 PD come from the employment based petition or family based petition?

Please discuss the issue with your attorney.

Active L1A / Expired and used H1B - Can I apply for a cap exempt H1b?

I agree with my colleagues. Also, your employer can file new H1B that is subject to cap.