Yeah, clownfish have a kind of abusive relationship.
You don't need to do anything, except keep an eye on the tank so you can watch them mating if you get the chance. If you have an anemone they're hosting in, they'll probably lay their eggs somewhere within reach of the tentacles, if not, it'll probably be in whatever spot they usually run to when scared.
The good news is that the eggs will most likely hatch in your tank. The bad news is that all of the larvae will probably be immediately eaten by everything in your tank, including possibly your anemone, with the possible exception of E. quadricolor (BTAs.) But corals, shrimp, other fish, crabs, even worms and large amphipods, if they get the chance -- everything loves a mouth full of newborn fry.
Don't worry, though -- once they start laying, clownfish pretty much keep a clutch of eggs going almost constantly so long as they're well fed and generally in the best of health. Mine lays another batch 4-7 days after the prior hatches. So don't worry about this upcoming batch, it's probably doomed. However, you might be able to get everything you need, and all the cultures going, by the time the next batch is ready. Others have posted good resources for info on actually rearing the larvae.