No, you don't HAVE to. You can use only the guitar, or only the drums, or all of them.
no. but you need a guitar, or microphone and controller to play
No, net necessarily. You do need a Wii microphone
Yup :)
You only need 1. It is for the microphone.
Yes, but you need a microphone or a drum set.
You can use your Xbox360 Wireless headset to play!
No I tried it does not work at all
yes
No, a Rock Band 3 microphone is not compatible with the first Rock Band game. Each game in the Rock Band series uses different hardware and software configurations, and the peripherals are designed specifically for their respective titles. Therefore, while the Rock Band 3 microphone works with Rock Band 3 and later games, it won't function with the original Rock Band.
yes because they both run off of usb ports
No a controller is not a Microphone and can not be one
As long as it is USB, any microphone should work with Rock Band. In fact, the Xbox Live headset even works as a microphone for this game.