Flash Fiction is hard but rewarding, and has a much better hourly payrate than your first few novels*. The awesome Angela Meyer opines about it thusly:
Those who know me have probably realised I’d eventually get around to using whisky as a metaphor for writing. Flash fictions—stories under 1000 words—are like a good dram. You savour them, roll them around in your mouth, are left with resonant remnants.
Here’s a little guide to tasting flash fiction.
*this fact may have been pulled out of my backside but sounds about right.