i just started some seeds i got from a buddy.. he said its pretty easy to grow, keep them 12 inches apart for best pod production but they can be closer but they will come out smaller.. veg and flower times are opposite of marijuana, 12/12 veg (cabbage stage) 6/18 flower..
i dont know how to get seeds i got lucky cause my buddy made some poppy tea out of some dried pods and he keeps the seeds so he gave me a few thousand..
i have heard you can try the McCormic poopy seeds or whatever the spice brand is but they are lightly cooked so they are hard to germinate
good luck