I couldn't create a logo from scratch if I had to. However, here is a site that will get you started.
http://www.logoinstant.com/ offers you a couple dozen logos to choose from. The best part is, when you download the file you'll get a .psd or .ai file that you can edit.Above is a sample logo offered. I downloaded the Photoshop version of course ;-)
It came with all the layers I needed to edit the text and background color.Here it is after editing it in Photoshop.
It's a great way to create a logo if you have no idea how to get started. You'll find several different themes to choose from.
However, I did have to crop out their logo in my finished graphic. Not a problem when the rest is free. Enjoy!