The first step is to research/design the character. Understand as much as possible about them. Next is to get a basic idea of what it should look like, using references and communicating with the team to stay on track. Once this is all completed and confirmed, move on to the production stage in Z-Brush. Start with a low-poly block-out of the character. Then, turn on Dynamesh. With every stepped increase polygon count, move the mesh around and build up the defining features. This repeats until the sculpt is finished. Communicate with the team and make changes/cariations where needed. Retopologise for export. This is the high-poly mesh. Once confirmed, export and open in Maya. Here build the low-poly mesh around the high-poly, keeping it as close and as low a face count as possible. Create UVs for the low-poly mesh. Then, export the low-poly mesh with the UVs and import to Substance Painter, making sure to set the file for Unreal Engine 4. Here, bake the high-poly to the low-poly. This can now be textured on the spot or passed on for texturing which will then be ready to animate and use in Unreal Engine 4.