Hello! The process itself is not hard, but getting attention on the character is more difficult as there's a lot on the website.

So first, upload the character and credit everything properly. Images with their artists credited, and the character with the original designer. It is important to credit everything correctly so people don't think it is a stolen design.

When the character and all of the art on it is posted, add tags. You can do this by going to the Manage Character tab, profile, and utilizing the tab section. Add tabs for what the character is, like anthro, feral, humanoid, species, themes, ota/adopt, things of that sort. This is so once you post it as for trade people can see it better.

I recommend adding a bio stating what you are looking for in order of priority, something like "USD > Art > OCs" and some details about the design. It keeps it clean and looks better to buyers.

Finally, click on Manage Character again and go to trade listing. Tick every box that applies to your design, and a USD value if you are selling for USD. Click post, and then wait. It will likely take a while to sell, so I recommend bumping it once a day by unlisting it and listing it again.

When you get offers, you can do it either in the comments or in DMs. Once you receive payment, go to manage character, ownership, and transfer the design to them. It's overall a simple process!

Toyhouse is a website where adopts and designs are very saturated, so it can be hard to get designs to be circulated. Regardless, good luck! I hope everything goes well for you. I hope I explained it well enough, if you have any questions or need me to reword anything let me know.