Battery?

Hello CBR lovers...

I'm new here and new to the bikes.
Been riding for good 3 months now!! -=)

I think my better has died and it not starting and I dont know anything about bikes.

How much is the new battery? How do I take it off, bc i'm having a diffcult time trying to take the current dead battery off the bike.
Shoot, Anyone around La Mirada CA area? Help me replace the battery for me and I'll take you out for a beer!.

Thanks