I had a Kaffir and a Key Lime trees up until two weeks ago. Then the state (Fla.) came by and took it away claiming that they (my trees) had citrus canker. My did not have it, but for the better of the industry...
Anyways to answer your question, they are easy to grow. They need full sun light, this is so that the plant will bear fruit. Watering, you need to water throughly and let it dry out between waterings. The plants do not like to be water logged.