If 2 of your clownfish just died you may want to focus on keeping a pair for a year or two first.
The book Clownfishs by Joyce Wilkerson will tell you everything you need to buy. This is where I found the information when I was going to try breeding clowns. Keep in mind that it is hard and requires alot of time(changing water, raising alagae and rotifers, brine shrimp, etc.).