[willing to learn]

Ravens should not be to hard to photograph, first find a area where they are resident, watch from a far try to establish fly paths feeding grounds and roost. Build a hide after your recon, place some food, Day old chicks are good. Bright, spotted easy, and they like them. You might need to tie the food down as they might just nip down and carry it off. If their about you will need a mate to follow you in the hide. And the leave as otherwise they will know you are about. When your mate leaves it will fool them into thinking you have left. I would feed for a few days let them get confident before you venture into the hide.
Regards
Colin