How much should I charge for design services?

You shouldn't charge an hourly amount, but a 'set amount' for each of the different things you are doing ... be sure that you give enough money to be able to take the time to do each job properly, but you should also charge no more than a 'median' amount (the middle of what is charged for similar items) ... you should also know that if you are doing the print-outs on your printer, that the brochures and booklets should have a 'set charge' for each copy, as a book would cost, and add that into the total amount. I know it's difficult to do it this way, but this is the professional way to do this 'pricing' ... and it's actually more fair to both you and the client.