Whether you write in uppercase or lowercase has no bearing on the outcome of the case as long as you know how to write proper English.

Usually, it is faster for a spouse of a greencard holder to receive greencard benefits while she is legally present in the US.

If your grandparents had adopted you before you turned 16, then yes you can wait until you are 21. Otherwise there is no such category as filing...

USCIS.GOV has the information you seek and it is in public domain

If you try to get your name changed on the existing visa and passport, you are unnecessarily administratively complicating the process. It is...

The total number of days you spent within the 5 year period immediately before submitting the application may be inquired into by the officer.

You need to demonstrate continuous employment abroad for at least one year in the preceding 3 year period.

You may explore the possibility of filing an application for an advance hearing. You should speak to a local immigration lawyer to discuss the same.

You don't need to worry about this at all.

Yes, you can apply for extension; just make sure that the extension request is submitted before the termination of the one month period.