CBP says they don't have record of me entering the US.

The stamp in your passport is evidence of your lawful admission to the US. You can also contact CBP and ask them to update the on line records.

What should I select on part 2 of form i485 If I have a u visa.

select h adjustment based on U on the form

What can I put down on part 1 of form i485 for date of last arrival under u visa

Use the date you last came to the US regardless if the entry was lawful or unlawful

Can my wife file petition and apply waiver for me ?

A C1/D1 is not eligible to adjust status in the US. A waiver may be possible for unlawful presence but this will be submitted during consular...

Should we get married in Guatemala or in the US?

The question is intent not if you are married. A person traveling on a visitor visa must have non immigrant intent. The burden is on the traveler...

After approval of I-140, can we switch jobs and should the new employer apply for another GC application for my H1B renewal ?

You do not necessarily need to return to Company A. You do need a valid approved I-140 for extending H-1B beyond 6 year cap. Speak with immigration...

I live in the USA and received social security and ssi and my husband live in the Bahamas and he work as a nurse can I sponsor

If you are a US citizen or Lawful resident of the US you may petition for your spouse. If your income is not sufficient you may need a cosponsor...

How do I get a financial hardship waiver for a IID

Not an immigration question. You may want to repost on a thread for DUI

Yes you may do so. The invitation letter should be presented by your friend in applying for the visa

J1 to J2 by marriage.

Generally a change to J-2 is permitted. If your the J-1 has a home residency requirement the J-2 will also have such a requirement. Generally,...