My character is a half-elf, aged academic globetrotter researching ruins, fauna and flora - anything he can get his hands on really. In his 100+ year career it stands to reason that along with any research papers or the like, he would have additionally written some material for public consumption. Encyclopaedias, books of fact etc., along with perhaps an autobiography or two as he's pretty well renowned.
My group has never played D&D before but we're playing the Lost Mines of Phandelver campaign, set in the world of Toril, which is a stereotypical medieval world.
Assuming that the world has a publication system and royalties, what would be the most likely way my character would physically collect the money, and how much would be reasonable amount be per week to not break the game? My group currently has no idea about the value of currency at the moment.