You can't unless your have a license to buy or sell automatic weapons T.T
Automatic weapons as we usually think of them are really semi-automatic. That is, you fire one bullet for each trigger pull, and the weapon charges itself with a new bullet automatically. These are not assault weapons, though most politicians think they are. Real automatic weapons will 'spray' out a stream of bullets as long as the trigger is kept pulled. These ARE considered assault weapons. They were outlawed largely because of their use by gangsters who had more firepower with them than the police did. Automatic weapons are pretty dangerous because of all the firepower they emit. The killings that you read about where "Assault" weapons have been used, have NOT used assault weapons, only semi-automatic weapons.
no
You can. It is not against the law to own fully automatic weapons provided you follow all the rules. 21, clean criminal record, money to buy, CLEO signature, etc..
you get the weapons from quests or you buy them
You do not need licenses for airsoft guns, as they are not firearms.
You can buy one but you can't drive it.
In a way the M16 is a machine gun, but it can also do three round burst and semi automatic. civilians are not allowed to have automatic m16s unless you have an automatic weapons permit, but you can have a semi automatic M16. (an AR-15 is almost like an M16 and much cheaper if you're looking to buy one.)
IF you are properly Licenced.
you cannot buy it as an automatic, but you can pay to have it changed to an automatic
probably at party giant
The accepted procedure in deploying the equipment.