We just have started a same thing. A cover rock band in order to earn easy money (it´s pretty popular here in Sweden) and to get stage experience. Here´s a few songs that we play:

KISS-Detroit rock city
Mr. Big-Wild World
Kravitz-Are You Gonna Go...
AC/DC-Highway To Hell
Europe-Rock The Night
Dire Straits-Sultans Of Swing
Eagles-H. California
Scorpions-Rock Me Like A Huricane
GNR-Nightrain
Ozzy-Crazy Train

and so on. Pretty famous songs but it´s not always good to ply only famous stuff. Somthing unfamous by a famuos band can hit it harder than 5 mega famous songs.