Unless you want to go all out and do it right, the best you might do is break even. That's if you don't count labor! If you have a place to sell them, angelfish are as easy as any and sell as well as any.
Personal experience? I found a guy who wanted me to raise fish to sell through his shop. All went well until the fish reached the size he specified. Then he had all kinds of complaints about color, fin shape, etc. and since it would be "so hard" for him, he could only give me half of what he had talked. Now, I don't breed and raise fish! I'm still pushing fish from my house!