Hi Poppy, and welcome.
You're very welcome to post details in the "Buy & Own" section on here. If you have photos in an online album (such as Flickr) you can post them too. Or if there are pictures on another website you can post a link to them.
Unfortunately our software doesn't allow for direct uploading of pictures from your computer.
If another member enquires about it on here, I can give you each other's e-m addresses if you both agree, for direct contact. You will probably get suggestions here for other sites yuo can advertise it on too - some free, some for payment.
However you do it, take the obvious precautions - don't release the van, the V5, or the keys until the money is safely in your bank, and make sure the V5 transfer is completed immediately after the sale, so you stop being responsible for the vehicle.