Bitten off more than I can chew

So I volunteer sometimes for an anti-poverty group, and I print sometimes at the print studio. Both based in Hackney. At the Anarchist Bookfair I had a lightbulb moment when I remembered Just Seeds collective, who sell their work to fund community projects. Maybe I could get the printmakers to give me some of their work, we could sell it as a fundraiser for the voluntary group, which is constantly broke, the voluntary group gets some much needed cash and the printmakers get a warm glow of benevolence, everybody's happy.

I proposed it and have just had an email back from one of the artists to say she'd donate some work - hurrah! (She's a proper artist whose work is collected by the British Museum and everything.)

But she did mention the word 'auction' in her reply. I was thinking along the lines of a stall down Brick Lane with prints for a tenner, but maybe they wouldn't want to sell off their lovely work cheap on a market stall, plus also if we did have a proper auction it would raise more money.

The only thing is, how do you set up an auction?