Will my VISA stamp be affected if I select Current Employer as not Employed in DS 160

You should answer correctly. If you have a new employer so state.

Does the united states allow dual citizenship?

US does not prohibit dual citizenship. The US for all purposes will only recognize your US citizenship.

This not an immigration question.....

Immigration officials came home

The visit is to determine if you and your spouse have a shared life together. The burden of proof is on the petitioner and yourself. You should...

Do i need a bank statement for me as a spouse to an american petitioner for immigration from kuwait to USA

Check the instructions for any form you are completing and submitting for required evidence.

Try contacting the NVC for this information

Should my spouse H4 be transferred when I transfer my H1B to a new employer ?

You should speak with your employer. Some employers require the H-!B to obtain separate counsel for the spouse.

I have an L1 A visa and i want to apply for the green card is that possible?

Your employer may file on your behalf in the EB-1.3 classification and if eligible you may concurrently file for adjustment.

Can a previous Employer apply for PERM green card while you're not working there until you get your I140 approval and then ...

Yes. Employment is not required to begin until either adjustment of status or entry into the US as a resident occurs

How much would be handing in the Form I-212 for a waiver of inadmissibility, for the beginning, to finally get back into the US?

You will need to contact an attorney or a couple of attorneys directly.