You must await the actual EAD card. You may use your old passport number. You might update CBP with your new passport number.

Do I have to wait for a confirmation for the I129 withdraw application before sending my I130 application

You may file the I-130 immediately. You may and should also file the green card application forms at the same time which is permitted when marriage...

H1b extension beyond 6 years with Successor in Interest I-140 pending

An H1B extension will be eligible for a 3 year H1B using a prior employer's un-revoked/withdrawn I-140.

I don't see an issue with moving to a different address while on TN. Unlike, H1B and analogous to L1 transfers to different offices are not...

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How to get tax transcript the fastest way ?

https://www.irs.gov/Individuals/Get-Transcript. you may call as well as email.

Is uscis actually working on u visa i918 cases? Their processing time is stuck on may 2014 since 10 months.

Yes, welcome to our world of immigration backlogs, understaffing, and underfunding.

What are some "request for initial evidence" reasons ?

Request for initial evidence is too broad. In relation to what category of US immigration sponsorship are you referring?

Will I get any trouble to get my citizenship since there is a lawsuit is ongoing against me

I don't think so. A single civil suit would not generally imply poor moral character.

Should AAO notify appellant of receiving brief?

The USCIS website may state the case was forwarded, You may call the AAO.

You may work remotely from home. It is permitted. Because, of the difference in answers I recommend you consult an immigration attorney to explain.