First, you need a master level in Alchemy, and around 30k gold. Second, go to Skingrad and buy a house from the buter there for 25k. Then, visit the trade goods shop and buy the kitchen, dining room, and servant's quarters. Look around in the shop for a woman named Eyja, hire her as a servant for 150 gold. She will make you an unlimited amount of Shepherd's Pie, which can be made into a potion and sold to a shop for about 25-35 gold a potion.