Also, I recommend have like 15k sapphires. So start small with your shop until you get around that. Then find cheap prices like Franken, fireflies or mores. Then set them for a higher price, make sure it's fair too. You don't have to advertise, they can sell over night in the explorer. Save your sapphires btw! Never accept high priced items that are over and not fair just because you want them.
Also, I recommend have like 15k sapphires. So start small with your shop until you get around that. Then find cheap prices like Franken, fireflies or mores. Then set them for a higher price, make sure it's fair too. You don't have to advertise, they can sell over night in the explorer. Save your sapphires btw! Never accept high priced items that are over and not fair just because you want them.