Before a USCIS officer sends an RFE

They should have reviewed all the submitted supporting documents - how else would they know what additional evidence is needed to process your case?

How is the process to adjust my future wife under J-2? I received J-1 when I was a single

She needs to apply for the J-2 visa after you get married at the US consulate of her country.

Can I teach online on CPT part-time (no more than 20 hours per week) under my F1 visa status? What is the process? (tax etc.)

You should consult with your DSO. They should be very helpful.

Is there any lawyer in DC/ Arlington/Fairfax area that would help me? and also offers consultation maybe on phone and weekends?

There are many lawyers who will not treat you like that. You should feel comfortable speaking with your attorney. Feel free to shop around.

Generally, no. This is because the H4 status and accompanying EAD depends on you holding H1B status. If you leave, your visa is no longer valid and...

Is there a minimum time period a person on a multiple entry tourist visa has to spend outside the US before re-entry?

No, generally there is no minimum time period that a person on a multiple entry tourist visa must spend outside the U.S. before reentry.

If my wife adopt my daughter, is she covered under the Child Citizenship Act of 2000?

What do you mean by being in "implied status" ? It depends on how old your daughter is, among other factors.

Should I get another medical report just to be safe? Should I present the 2015 federal tax return for my mother/co-sponsor?

Generally, you have an effective date of one year for the medical examination report. Yes, send them current as well as past income information...

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Do i need to do transfer my H1B visa to Company A . ?

If it's really urgent, you could get a more direct and immediate answer by Company A's immigration attorney who knows all the facts of your case.

Is it better for my uncle to apply individually or apply with his wife and son as well?

It is more likely that the B-2 visa will be granted to him if he comes individually.