If a person enters the US on a tourist visa and marry can their husband/wife file for them after they return home?

Sure. You can file an I130, once approved they will apply for an immigrant visa in their home country US embassy. You can Review the embassy's...

Changing employer when H1B Extension in RFE and I94 expired couple of months ago

New employer can file new H-1B as change of status. If the extension is denied you will need to leave the US and reenter using a valid H-1B visa...

I just need to find out if I have been banned from re-entry to the US, for how long and if I can appeal.

Consult with a lawyer regarding filing a FOIA request to obtain your records. It may also be apparent to a lawyer if you are subject to a ban if...

Immigration officer questioning

It can help to have a round trip ticket if you are questioned, but it is not a requirement.

I am applying for my L1 visa & I have received my petition. However, I want to get L2 visa for my wife

She needs to apply gor the L2 visa at her US embassy. She will need your approval notice and evidence that you are married.

Unlikely to be expedited. You can try but Plan on waiting it out.

Filling I9 form after getting Green card. Is it mandatory?. Was with same employer for more than 4 yrs

No issue upon entry. At some point your employer will need to fill out a new I9 from for you and you will have to disclose your new work...

I have applied for change of status on October 12th (h4 to f1) at that time my h4 visa valid till Dec 31st .

No need to notify USCIS of your extension as long as you filed the COS to F1 before your H4 expired.

Can Chiropractic clinic sponsor Acupuncturist(H1B visa)? There is no Acupuncturist in this clinic.

Seems doable as long as there are no licensing issues.

How do i bring a relative to the us from mexico

She needs to apply for a B visitor visa. You could write a letter explaining you have invited her to visit and will provide her with food and...