Unfortunately, I'm not aware of a simple guide to creating new infobox types. As far as I know you just need to be sure your wiki has installed Module:Infobox and from there you can copy Template:Infobox or Template:Infobox_Girl from us and modify them to have the fields and structure you want. Maybe add some styling in MediaWiki:Common.css. There's a whole cluster of pages about infoboxes on Wikipedia, and the info there mostly applies to any wiki using MediaWiki, but I wouldn't call those pages idiot-friendly.
That said, what is this other wiki? Is it for works under one of her other pseudonyms? If not, I feel it would be better and easier to just make the non-TLS pages on the TLS wiki more visible/accessible, rather than go to the trouble of setting up and running another wiki.