First, welcome! Second, you were on the right track to getting the drum off. You have to pull those bolts off the hub and pull the axle out. Then there is a nut, a lock ring, and an inner nut. Remove those and the drum will be ready for removal from the axle tube. However, with the brake dragging you will need to get into that access hole and try and back the shoes off. Just be patient and keep at it and you will get it.
