Drum programming on Reaper?

Does anyone have an idiot-proof tutorial for programming black metal drums in Reaper? I have some experience with Ableton but that was years ago and a completely different type of music. Been writing some freaky, riffy songs lately on guitar in the vein of Mortuary Drape, Negative Plane, KPN and Grave Pilgrim so it'll be a bit raw and the drums don't need to be insanely polished, I just need to know how to program them lol any tips appreciated