You can find other players by looking for the blue badge icons on the map - those are commanders on your team. Green dots are players on your team as well but they only show up when you are in fairly close proximity.
Sometimes you might find a large group running without a commander tag, this is likely an organized guild group and they may not want you to run with them since fights can be lost by a single player (referred to as rallybots). Ask them if you can join them before tagging along.
Orange swords indicate a large fight happening, white swords just show an objective being attacked and can be triggered by a single player.
Join your server's Teamspeak to get in on the strategy, there's a lot to learn! Also very helpful to learn the names of the different objectives so you can relay enemy movement in map chat (25 JQ heading north from Bay, 5 BG at north camp, etc.)