How to obtain a green card after having been on H1B?

Talk to the employers immigration attorney.

If filling a I-130 for my brother, do I need a G-325A for him and does he needs to sign it?

No. In case of doubts on your case, consult an immigration attorney.

Am a fiancee visa holder , can I file for social security number and employment authorization before marriage?

I would strongly advise you to get married within the statutory period first.

If a move to Spain and marry a citizen of Spain, what is the procedure.

This is a Spanish/international immigration law question. As to the type of paperwork you'd need to file, it would be a question of Spanish...

Can I visit Canada and return on the VWP to await the outcome of my application for permanent status?

I agree with my colleagues. This seems problematic. The visa program is designed for non-immigrant purposes while adjustment of status applications...

Do I need to list my employment history as well as educational background in the form I 485

Neither. You need to list any clubs, organizations etc. You were part of.

Selected as the best answer

H1B extension denied and applied for h1 to f1 transfer before h1 denial. Can I stay in US until Change of status is complete?

If you filed the F1 timely.

Does my 9 month old son accompany us during visa interview at toronto??

It shouldn't be a problem. They may not prefer having babies there, but you are all human beings. If you want to go absolutely sure, you could call...

What happens to a permanent resident who neglects to renew his permanent residence?

I agree with attorney Mosley. You should consult an immigration attorney in person to determine if you can simply renew the expired GC even at this...

Can I apply for the dream act in my situation?

Assuming you are referring to deferred action (DACA), it would appear that you are unfortunately ineligible due to having been outside of the...