Would I have an issue?

You should be fine for domestic travel. Are you a DACA recipient?

Under 129F Petition and under k1, k2, Is form G325A needed for children ages 8 and 12?

G-325A is not necessary for anyone under the age of 14.

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H1b to L1: What are the consequences?

Enter on the L1 visa. There should not be a problem.

Can i appeal against approved I140 revoked by employer.

No, your employer has the right to revoke the I-140.

My fiance is wants to study in USA with student visa and We want to get married, f i apply for him, are there any problems/

Consult an immigration attorney first. They will save you time and money in the long run.

How to self petition for EB-2 permanent residence?

Self petiton doesn't mean you will not work. You need to work here and explain how/what you will do. Consult an immigration lawyer.

What will happen if I leave us without travel parole?

At the very least, you will encounter problems at the airport and the airline will not let you board. This is not a wise idea.

Just did interview for naturalization. wife on O1B visa. should I file now or wait until citizenship is finalized?

Wait until your citizenship is finalized then file adjustment of status for her.

How to obtain a National Interest Waiver (NIW) for a self-petition for an EB-2 green card?

These are very difficult to obtain and require the assistance of an immigration lawyer.

I filled out i-130 for my husband 5 months ago, now he is being arrested in his country.

He needs to disclose the arrest. It may or may not effect his ability to get a green card.