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]
Yes at www.playr.org and search Madden NFL and get three versions. Pick the one you like.
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.