Removal order and new i-130 petition based on marriage?

Since you must overcome an order of removal prior to your current marriage, you need to hire an experienced immigration attorney to assist you.

How should I fill out Part 6 of form I-864 if I filed an extension for the 2018 taxes?

List your 2018 income from your W-2 and include your 2017 tax return and 2018 W-2 with a notation as to the reason.

General inquiry?

Very few. To extend a tourist visa requires a very good reason. Best is to get a job offer from a US employer that can sponsor you for a...

What status would I be on?

Your H-1B "kicks in" on the start date for which it was approved, presumably 10/01/2019.

How should i calculate remaining period of H1B?

You add together the actual days you have been in the US in H-1B status. Your travel history located at the I-94 website can help.

Is it Possible to revoke H1B Visa for which extension has been denied?

A denied H-1B means that you are no longer in status whether the employer revokes it or not. If you find a position quickly and are not incurring...

Can someone with a green card come back to the United States after being overseas for years?

Extremely problematic. They should have applied for and gotten a re-entry permit allowing them to stay out of the country for two years and then...

Change from j1 to h2b?

You need to get a no objection statement from your government, a waiver from the US State Department and then apply to USCIS. This takes time and...

How to get I-140 approval notice from USCIS?

I agree: you need to seek legal assistance for this.

I suggest that you ask your company for a print-out from E-Verify and attach it to the RFE.