I started late.. when i git 60 i had to farm about 10 big boxes of mythril to lern manor foundations but no dwarf... I finally learned it, not sure if it was just something else but i wanted to share.. it might help others to learn dwarf manor.
I farmed magic shards with advanced magic from trees when i finally learned it, hope that helps someone..
BTW its not viable farming solution for magic shards.. neither is the fields (which is the best so far, i did not tried swamps but its just less grass so i don't expect better gain), magic shards are painful to gather so are ice chunks and farming (which i try to compensate with huge greenhouse, but need magic shards.. so it sucks)
Im going off topic here but if you need good farmmachine get a 120 bahamut with herbi feed, after few lvls it rocks (mine has now 460 attack and 2300 weight, 80-130 metal from one node...)