I don't have any close friends who are in a band, so I don't really know anything about the basics of forming a band. I don't even know all the instruments that you need in order to form a band! All I know is that you need to have a vocalist, a guitarist, and a drummer and you can have your band!
For all of you who are in a band, it's a good thing that there are a lot of online shops right now that specializes in musical instruments. You can even find a guild f 212 at Musicians friend. Just search for the instruments that you like there, you might find that they're on sale too!
Happy instrument hunting! :)