How do I market board?

[SeraviEdalborez]

1) 20 per retainer. Make a 2nd retainer if you haven't already.
2) People who buy from the same city as the retainer pay a slightly smaller tax. Makes no difference for the seller. You can change retainer's location by speaking to the retainer vocate in the desired city.
3) See 2
4) Don't undercut by a huge margin, use the price history and current listings to make a good gauge. Varies by item and by server.
5) Don't undercut by a huge margin, seriously.

Anytime you are not interacting with the retainer, they will be on the market listings for items you tell them to sell. You don't need to actively police it.