LLC formation for newbies

[Dilip Gandhi]

Hi all, 

I am negotiating to purchase multi-houses portfolio in Las Vegas

Although, there are tons of reference on BP about this, but have a specific question. 

1) Is there any difference for LLC structure formation for US citizen and non-US citizen residing outside US.

2) Which is the best state to register LLC company to benefit from minimum tax and annual registration charges. E.g Delaware

3) What all charges should be considered before LLC formation.

4) Will there be different structure for single named LLC and partnership LLC.

Any guidance in this regard is appreciated. 

Thanks and regards

Dilip Gandhi