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According to www.tagsalestyle.com:

1. Make fair prices for both clients and buyers.
2. Protect/secure any off-limits areas/items.
3. Research market value on the stuff you don't know.
4. Do not misrepresent any items. Disclose any imperfections or problems you're aware of in an item and encourage buyers to carefully examine anything they're buying.
5. Control the number of people in the home and make sure everyone leaves with what was paid for.
6. Do not sell any items you cannot legally sell.
7. Manage your clients' expectations. Make them aware of fair market value for their items and help them understand what will go on inside their homes.
8. Accurately advertise items for sale.
9. Remove all conflicts of interest related to purchasing items from your own sale.
10. Make sure you have enough staff covering areas crowded with small items. 
11. Do not disappoint shoppers by advertising/picturing items you have sold in advance. Make sure everything you advertise is there for the day of the sale. 
12. Be transparent about how unsold items will be disposed of. Avoid conflicts of interest and suspicion that items aren't selling so you can claim them free of charge later.