I agree with @missmovies: suggestions for sites. Craigslist is great because people can come look at the stuff in person and you don’t have shipping costs. It depends how big your area is – the bigger area, the more active the Craigslist.
I haven’t resold wedding items yet, but I buy and sell a lot of used stuff (moving lots, selling furniture and rebuying was cheaper than moving it, big into home decor, etc). Here are my suggestions in general to get stuff to move:
– GREAT photos. Post both photos you take in regular lighting of the items and pro photos of the items at your wedding when possible. You have to help people visualize how it can be used. Showing them pictures of the items at the wedding really helps them imagine how wonderful it can look. Never use stock photos – I don’t trust them and want to see the condition of the actual photo, not a stock photo of it before you purchased it.
– Good descriptions. Bullet points are helpful. Give dimensions, counts, colors, etc. If you can compare the color to something people can look up, even better – like David’s Bridal colors. I’d suggest saying what DB color items are closest to, so many people use their swatches as a starting point.
– Start your prices a little bit higher than you want to sell the items for and put something like “or best offer” or “open to negotiation.” People like to feel like they got a deal. Don’t put them so high that it would deter someone from opening your ad, but put them high enough that you can come down a little.
– Use keywords in your ad. Are you selling a vase that you put a candle in? Well don’t just limit yourself to that. In the description, say something about flowers too. Think about the most common words someone would use when looking up wedding decor/items and try to include them in your description in some way. They key is to get in front of their eyes and search terms are huge for that. If there is more than one term for something (for example – sofa and couch), include one of the terms in the subject line and one in your description. Try to cover your bases on what people might search for.
– If it makes sense, mention other things people could use the items for, not just weddings. “Event” “Birthday Party” etc.
– If you are planning on shipping things, I find FREE SHIPPING to be a big draw. Intellectually I know it just means the price is higher, but people are so used to Amazon Prime and other free shipping things now that it seems to be a barrier to them to pay $20 for an item and then $10 to ship it. I’d personally try out putting the price higher but advertising free shipping. I’d put that in the subject line when possible.
– Be very prompt in getting back to people via email. People keep searching and looking for other items, and if you don’t get back to them quickly, there’s a good chance they may change their mind.