Oats are not necessary. They just act as a nurse crop. I have done it with and without oats and cant say that I notice a difference either way. Also if you are establishing a new plot then you will most likely have a weed issue and need to spray which will most likely kill the oats anyways.I am interested in responses to this as well. I like the steps that Sure Shot laid out and curious if others agree with those steps. I am halfway through my first year of trying this as well. I already frost seeded clover into my 1/2 that is brassicas, sounds like I need to do some oats as well.