You should seek advice from an immigration attorney and provide them details of the of the complaint and of the plea deal.

Can I go back to Canada while my adjustment of status is pending??

You could with advance parole if you have one.

Can I get a k1 fiancee visa if I'm missing 1 of my 3 was they need

You could get it from IRS if you really need to have these older documents. But I think you could just do as well with the most recent one you have.

Just receive notice of action I-797C

If the case is transferred to NVC you should get instructions from NVC on the steps necessary to be followed for further processing. Unless you...

Is it mandatory to give experience certificate of all experience(8) for EB2 category or just 5 years experience letter is enough

check with your attorney if someone else could give you that letter. If you have an attorney they should be able to guide you on this.

Is h4b extension illegal ??.can she come to USA on any visa or she should give up ??what should she do

Please note visitor visa has a high rate of denial and just like any other visa application it should be well presented. Her previous stay is...

Provide an explanation and include copy of the court decision.

When will I get Green Card...

My guess is that you received the EAD approval not the permanent residence approval notice. Check the right top corner of the notice to confirm.

Can I work with my current employer for 1 month with my current TN? What would be the procedure to follow?

you can not continue to work with the TN employer starting 4th unless you take certain steps. Check with your TN employer but then again returning...

Applying for US citizenship while traveling abroad frequently for work.

Travel abroad and stay away from US is closely calculated to determine eligibility for Naturalization.