Yes, because if you are gone for too long, you might not be able to re-enter the US.
It is easier if you apply for a visa first and live in the US. Once you have been here for a while, then apply for the Green Card.
You should have a green card to be able to live in USA.
A "Green Card" is permanent resident card. By definition you can NOT live somewhere else. You can live in the USA and holiday elsewhere, but not the other way around.
As a green card holder staying in US you have the rights to live and work there. Apart from this you can also petition for your close relatives using Form I-130 for them to get green card. Above all after five years of being a green card holder if you are eligible you can apply for US citizenship.
That is allowable.
No as a green card holder already its mandatory to always have your green card handy.In case you have lost it you can get a replacement using the Form I-90. In case the green card was stolen you need to attach a police report along while filing the form for replacement of green card.
yes they can do that
No. A green card is issued to foreign nationals residing in the US.
Can you stay eight months out of US With green card ?
Yes, but the US citizen should sponsor his/her spouse's immigration in order for him/her to get a green card.
Yes
The process to get green card can be through marriage,employment or through relative and should be petitioned for by the US citizen or green card holder spouse, employer or US citizen relative or green card holder in US respectively. Depending on the availability of the visas under the category you apply the time period to get a green card changes.