Yes you do get to.
No, you can use the guitar hero 3 controller, which is wireless, for guitar hero two
no
no, you can use a controller.
Yes.
yes
no
I don't believe you can use the PS3 Guitar Hero controller on the PC to play anything
That completely depends. Is the guitar hero 3 controller for the same platform as the guitar hero 2 controller ? (I.e. xbox 360 or ps2)
Insert another Guitar Hero controller, The Guitar Hero Controller if you are playing with a system controller, or your system controller if you have a Guitar Hero controller. I use a Fender Cream Strat when I'm using Guitar Hero for my PlayStation 2. That is because my piano teacher, Rick loves Fender Strats.
yes
yes
yes you need to have a controller to be able to use the mic. (you can use the mic on guitar hero 4 and upwards)