There are many threads in this forum that go into more detail on breeding clowns, but you will need to get a male for your female. Any Ocell will do fine as long as it is smaller than the one that you have. look at your LFS for a group of ocells and pick one that is smaller than your female and doesn't seem to be that aggressive with the others. That should insure that you find a male for your female.
As far as equipment goes you will need a 10 gallon tank or black round tub, rotifers, rotifer sive, heater, light (any shop light will do), Phyto or past to feed the rotifers and tint the larvae water, air pump, tubing both soft and ridged. I'm sure that I'm missing a thing or two but this is the basics needed to breed clownfish
After getting another clown it will take a while until the new fish turns male and their bond is strong enough for them to feel comfortable for spawning. How long will depend on many factors. I've had pairs that took up to 2 years before they started to spawn and some that only took 2 months. It all depends on how comfortable they are and how mature they are. Also I cannot understate the importance of feeding. Feed good food often I mean at least 3 times a day. I like LRS foods for this but Rods food will work too. If nothing else feed a varied diet of many different things like mysis, squid, clams, ect. make sure it's all diced up small enough for bits rather than large chunks. You can also use dry foods in an auto feeder for times that you cannot feed. I like to use TDO from
@Reef Nutrition for this.
Many people keep spawning pairs in a different tank for the reason that all that food will raise nitrates and phosphates and fish can stand a high level of both but you will be feeding algae as well. Something that most people don't want in a reef tank. Not to say that clowns won't spawn in a reef tank because they absolutely do, but giving them their own tank is preferable because they will spawn on tiles or flowerpots provided that can be removed when it's time for the eggs to hatch. I've used larvae traps before and have had mixed success with this method.
Did I miss anything y'all clown breeders? most of my experience is with Mandarins and have done some clowns, clarkii maroon, and bicintus, but not many batches of them just something to do other than Mandarins every once in a while.