My basic process is to use Daz3D to create the figure and pose it, then export it in .obj format (which every 3D software - including most 3D print slicing software - on the planet can open). 90mm equates to roughly 1:18 scale which is great for resin printing as it's a good compromise between size and detail, and will generally fit the build plates of most consumer-level resin printers.
The slicing software doesn't really like complex hair though, so I usually either use very simple hair objects (from Poser 4 or other old software, as hair pieces in those are solid objects rather than complex multi-layered shells) or simply export the model without hair and sculpt it on later with Milliput or some other suitable epoxy putty.
I find clothes hard to do with my limited 3D skills though, so I tend to prefer naked models