So I've had my own graphic design business for about two years now. I do mostly stuff for bands such as album artwork, magazine advertisements, etc. Well I've begun to run into more and more problems with finding photographers to send the bands I'm working with to who will get the shot I need. I've always loved photography but have been too frustrated by all the technical stuff I do not understand, like aperture, f stops, and ISO for example. I decided to start working on it and learning all that I can so that I can take the shots I need to save time and the bands some money. I recently purchased a Canon 40D that came with a 18-50mm f/3.5-5/6 auto focus lens and a 55-200mm 4.5-5.6 auto focus lens. I will be doing some indoor concert photography (it will be dark with the light sources being random and dim) that will be very high action and wanted to know if these lenses will be sufficient and which would be better for what. And if both of these lenses aren't too good for shooting in these conditions, what would be? I don't understand f stops or any of that for that matter. I haven't received the camera yet, but those are the lenses it came with and would like to know as much about all of it as I can before it actually gets here. I'll also be shooting outdoor promotional photos and was wondering about the clarity those two lenses would offer for that? I appreciate any help in understanding this that I can get!