How much should I charge to design a logo? A web banner? an avatar?

I graduated last year with a degree in Graphic Design & have started my own business, which focuses mainly on special occasion design (invitations, announcements, etc.). I've recently been asked to design a logo for an online children's boutique in several resolutions and I'm unsure of how much I should charge. I've had logo design experience throughout my schooling, as well as having designed a few for myself throughout the years; but this is my first paid logo design job. Also how much would I charge for a web banner? And an avatar? Any help from others in this field would be greatly appreciated!