You hardly need a "course" for a taildragger, just a bit of practice with an instructor, or just someone who knows how. There's nothing special about it, just a slightly different technique for t/o and landing.
Grass strip? What do you need to know about that? Tarmac is black, grass is green. Farmstrips; again, a ride with someone familiar with them is enough if you feel the need, you did short-field take off and landing in your PPL training, what else do you need?