You'd be surprised. Of course you need to advertise. Be specific, concise and honest. State place, date, hours. If you have large amount of clothing, specify some of the sizes, particularly if you have quite a few in a few sizes.
Antiques go over big regardless of state of repair or condition.
Give good descriptive details to save disappointments. Capitalize on the season. Feature luggage at going-away to school or vacation time. Toys near Christmas. Today, bottles of all kinds are in demand.