For a quick and dirty you'll need an image of the character you are going to use. If you don't have one, have an AI generate one for you using CivitAI Pony Diffusion v6 XL with the No Artist Style; Smooth 2, LoRa. If you don't care about style use Perchance furry generator. You'll want a full-body portrait in 2:3, around 2k resolution though it can be less, with a neutral pose, and a simple plain background for background removal.
Look online for a free 2d to 3d model converter to make a 3d mode of your character. You should get a .glb you can import during character creation for your directionals.
Use one of the many online tools to upscale your image, 2k-3k is fine, and remove the background, making it a .png file. Import the image and .glb and that's the bare minimum you'll need.