Yes at www.playr.org and search Madden NFL and get three versions. Pick the one you like.
madden online its self does not cost a thing, however if you plan on playing madden online on an xbox you will have to pay for xbox live gold to use madden online.
Yes at playr.org [go on google]
No you need the game that you want to play
NO
no
yes
so you can play online
no
Online Team Play
Yes, plug 2 controllers in and play quick play.
Yes, but you have to be a member of some EA sports club thing. They give you a 7-day free trial, but after that you have to pay.
Yes it is safe.