Best way of generating revenue from a flex application?

Question

Hi all,

I'm currently in the planning stages of an app which I'm leaning towards Flex to build.

I've looked at the market for the software, and am fairly convinced that in its niche, it should do well (potentially large market, and nothing really of note that compares with what I have planned).

rWhat I'd like to know, as this would be my first application I'd be putting out on the market on my own, what advice and experience you can share with how to generate revenue.

Is some kind of flash/flex kind of AdMob the way to go? Subscription based service? And if so, how would you calculate the costs? Perhaps, an amalgam of the two, where maybe after 5 minutes, if you'd like to continue using the software, you need to click on an ad, but subscribe and the annoying ads go away?

I appreciate this is all subjective, but not sure where to ask for this kind of help.

Thanks very much for your suggestions.