Speaker And Radio Replacement

I have a 2007 G5 Coupe. I got it about a year and 1/2 ago and the front speakers never worked. I'm finally replacing them and figured that I'd like to replace the factory stereo with a Pioneer Bluetooth radio as well, but I'm not sure if it will fit or not and was curious if anyone would know or be able to help me out? And is there anything else I need to do other than just taking the old one out and putting the new one in?
The car doesn't have a Pioneer sound system.
Also, is the back speakers on the same fuse as the front?