New weapons are called "rings" in the game, in order to earn a ring you can kill a animated [monster] and the ring will pop out of it or you can do missions to earn rings. To invite people to your crew you click on the person you want to invite and hit the double arrow >> [going down]. There should be something that says invite and you click it. If the person is far away from you that you can't see him, you can go to recrewt and find his name on the list than add him.
You just have too keep killing and ranking up. Than you can do what they call "boss" games. Meaning you fight with a crew and get lots of gold. I'll help you, but my week is gonna be busy this week. sad