Moving music on homeshare?

I have two computers, a pc an and imac. I currently use my pc to manage my ipod but i want to start using my mac. I have alarge amount of music and apps on my pc, and i want it on my mac. I try syncing my ipod to the mac but it always wats to delete everything on i twhich i really dont want to do. The itunes on my pc doesnt work very well and i can never access the itunes store or use homesharing. Is there a way i can move all of my music to my mac? Can i homeshare from my ipod to my mac? or sync it somehow with out deleting it? please help