Hi all I'm new to this game and may be a really stupid question but how do I know what parts are co-op sections as me and some mates were playing earlier and couldn't work it out as I take it the big orange marker on the map is the single player campaign , but how do we play missions together or play with other people online as there didn't seem to be hardly anyone around considering how many players are supposed to be online .
All help would be much appreciated
Thanks pika