As Kate stated, that thread will surely come in handy for you. Personally, I recommend either Sculptris or Blender, both of which to my knowledge are free or have free versions. If you want to convert meshes, which many do, I highly recommend delED. Converting meshes is when you take someone's mesh and change it a bit for use in FeralHeart. I wish you luck in the quest for meshing knowledge Wolfie!