You have alot to learn
iwconfig is a tool for configuring wireless devices for various states apart from turning them on or off. ifconfig on the other hand is mostly for wired devices but can turn wireless devices on or off.
rausb0 is the correct device name for older ralink drivers (you don't want to try ralink's linux drivers as they lack functionality on areas like monitoring/injecting). Depending on the driver used, the device naming would be varied according to that, iwconfig will show you the list of devices and wireless extensions (if any).
Last but not least, there are docs on howto connect wireless networks. Google is your friend.



