Candle vendor idea! Opinions needed!

Our florist included candles. They had a bazillion different styles, colors, types of candles and holders, etc. to choose from, probably more types of candles than I ever knew existed. I can see your idea working well for people who are DIY-ing their decor and/or aren't using a full service florist. But these days I think it's pretty standard for floral companies to serve as the central place that takes care of candles, and many, such as ours, had a clause in the contract about not using outside candle decor that wasn't rented through them. So you'd want to market to people not using a florist

I have used 100candles.com and Amazon for candles in the past. My one piece of advice is that if you do scented candles for weddings, make sure they are LIGHTLY scented. People who use candles for wedding decor typically use a lot of them and I've been to weddings where the "light gardenia scent" was eye watering. I am going with unscented votives for my wedding, but I know some people do go with scents.

I would consider adding a division for decor setup which includes labor and transport fees. Couples rarely want to set these up themselves and the venue or florist offers free supplies, rentals, and set-up service.