How did you learn about being a landlord?

[Philip Sample]

I've been planning to buy a 4 unit home on an FHA mortgage, and rent out three of those units. Problem is; lately I've been looking at information related to being a landlord and well... it's really complicated. I want to learn but I'm afraid if I continue learning in bits and pieces from unrelated sources on the web, my knowledge will have gaps. Is there a better way? What did you do?