Give the title of the club (and accompanying text) a light glow to make it stand out
For charging, decide on an hourly rate and specify how many hours it took.. so call it £10/hour.. 5hours.. £50.
Though you can go higher than £10/hour of course.
The number of fliers is irrelvant to you, unless you are the one providing them. All that is relevant to you (and more specifically, how much you can charge) is how much of your time was needed to create the design, and any possible charges for images (royalties, etc)