You should be researching to find an experienced immigration attorney in your area to assist you with this problem.

Ported the date from EB-3 to EB2 successfully for GC, but still working with EB3 Company?

"Any complications?" Maybe? This question supplies only the vaguest details about your case.

I got my F1 visa stamped for Fall 2014 on June 5 2014.But I deferred my admission from Fall 2014 to Spring 2015.

You should discuss with the DSO at your school and obtain any required documentation for the Consul from the school.

OPT expiring in Oct and do not have a job yet. Can I go to India and then apply for H4 at US Consulate in India?

Assuming you are related to someone holding H-1B status, then it may be possible to apply for an H-4 visa.

Attending a conference, alone, would not be a violation of H-4 status.

Is an approved I 824 means you havent aged out? Is there a formal letter that you will receive stating youve aged out?

An I-824 is used for many different purposes, including attempting compliance with the CSPA, in certain circumstances. Any age-out case must be...

H1B Transfer

The H-1B Visa may be granted in advance of the actual petition's approval date, however, the visa will not be valid more than 10 days in advance of...

Can I transfer approved H1B before it starts?

It is possible that a new employer could file an H-1B Petition for you.

Submitting docs to National visa Center

You should follow the explicit instruction on whatever notice you are responding to at present.

What is first letter and when will it come?

If your priority date has become current and you are otherwise eligible for adjustment of status, you and your family could potentially file for...