[musictlk] Price rate for commercial jingle

[Ed Worrell]

Hello Listers, I am in the process of making a jingle for a client. This is my first jingle for a tv commercial. I don't know what to charge for my services, should I do a flat fee or charge an hourly rate, and I don't know what to charge. I am at a loss on this one. Please help and give me some advice on what is a good price to charge and if it should be a flat fee or hourly.

Thanks bunches 
Ed Worrell