You might start trying to re-establish your domicile in the U.S.
Ideas other than what beameup already mentioned are:

I wrote up a tenancy letter between my dad and I in his home, stating my spouse and I may live there indefinatley.

Register to vote, it's something you can usually do online, and then have papers sent to your US domicile address.

In my case, at my dad's house I have many personal belongings, I've got pics of those.

On my last trip home, I opened a joint U.S. bank account with my husband.

I opened and activated movie rental and library cards.

I renewed my State Drivers Licence.

I've got passport stamps and boarding passes showing that I maintained ties with my family in the U.S.

I made myself a resumè to send out when I do move to the U.S.

I've sent myself tons of college applications and info on insurance and etc. to my U.S. address.
Sorry I couldn't help on your other questions, don't worry though, you'll get it all figured out!