It's unlikely you will find someone.
Most companies that would do that stopped because it was not profitable.
As you have learned, selling online is not easy.
The consignment seller would want to hold the item in her hands, and would be photographing and describing the item, uploading it, and paying fees for listing, some options, and shipping.
In addition she pays fees for payment processing.
The most usual rate for the work was 40% of selling price plus all fees.
If your item sells for $100, the seller would be giving you between $40 and $50 .
Most consignors found that too high. The sellers found that too low.
You need a tape measure, a digital scale, a scanner or digital camera.
Use the Advanced/Business Sell Your Item form, which is linked in the upper right corner of the terrible Simplified form. It is more clear about what you can and can't do.
And if you have any specific questions, the Seller Board has lots of experienced sellers, who love to give advice.
