Headshots-HELP

I wasnt sure where to put this thread, but I thought since I'm working with Olympus, maybe this will yield the best help. If this gets moved, I understand.

I've been asked to do some headshots for an amateur actor. Now I love taking profile pictures of my friends casually, most of the time candidly, but have never done professional work.
heres some examples of what I've done for fun:
http://photos-b.ak.facebook.com/phot...61401_2830.jpg
http://photos-600.ll.facebook.com/ph...80635_7268.jpg
http://photos-600.ll.facebook.com/ph...80636_7589.jpg
http://photos-600.ll.facebook.com/ph...54133_7099.jpg
http://photos-g.ak.facebook.com/phot...13190_4848.jpg
http://photos-b.ak.facebook.com/phot...98913_7906.jpg

I have the 12-60mm 2.8-4.0 on my 510, which I think should be great for these photos, but I also have a 40-150mm 3.5-4.5, though I cant imagine it being a better profile camera.
I also have the Metz 48 flash.


What can you guys tell me about taking professional headshots? He will be informed that this is my first time, but I still want to know what I'm doing and be in charge of the shoot.

Also, how much should I charge?


any advice is appreciated!

I am going through the same thing. I am being ask to do this type work and it really isn't my cup of tea. But post a few in Studio and Lighting and Steve the Mod there shoots for a magazine and Adina and Alison also do awesome portrait work. They should be able to get you going in the right direction.