Welcome to C-rpg!
As Rainbow and Huseby said, it has to do with strategus. Though, technically, even if you get accepted they don't have to pay you anything regardless of how much or little you ask for, it's up to them.
Until you get a better grip on the game I wouldn't recommend taking part in strategus, as it can be a bit overwhelming for a newer player, and generally you're expected to be able to at least score a decent number of kills. For now, stick to playing in Battle and possibly Siege, and go to the duel server to practice. The duel server is incredibly frustrating when you're learning, but it's also the best way to learn how to play very quickly.
You could also join a clan that's accepting of new players. They can help train you and teach you some of the ropes, and also can tell you when you're ready to start taking part in strat.
Oh, and no you only get exp by default, it's possible to get money from them too but nothing else unless you're actually affiliated with one of the two sides.