Cersei Willems:
Well her parents were traveling merchant who died in a raid some years ago the sale of the wagons and such funding her and her brothers education she at a Great Library where she found the path of knowledge and faith. Her brother an apprentice to a blacksmith likely in the general area not as far away but its a good trade she encourages him to master and she might help him get his own smithy bring the big sister. See got that part.
A group of closely related nomadic merchant families in Ahlissa has wandered much of the old Great Kingdom's lands along the famous Windmarch, a vast annual circuit of mercantile trade fairs; little is known of this colorful group, called the Peregrines.
There is only one line mentioned about the Merchant Group called the Peregrines. You could take that and run with it. Its possible that the Peregrines are no longer around due to the raid a few years ago, Depending on where the Merchant Caravan was at when raided, it could have been close to Greyhawk City, which would be a melting pot for your character to learn all the NWP she has, and for her personal beliefs and philosophy to come out. Greyhawk would have been a good place to be educated. The Great Library of Greyhawk would have rows upon rows of books for her to read, and learn the paths of her knowledge and faith. Greyhawk is also filled with a craftsman district that has many Blacksmiths. Your brother could be associated with the Metalsmiths' Hall. The blacksmiths' guildmaster is
Jaskar Smithson [Neutral Human] He could be the Mastersmith to your Brother.
As for the background to connect you to the story at hand. Elkiar Rusman would have traveled this region and the Gnarley Forest a lot, and the Forest spans all the way from here, to Greyhawk City, Greyhawk City has even tried to claim the forest as theirs at one point. Its very possible that Elkiar Rusman helped Cersei in some way, or the two met while in Greyhawk. Or maybe you are being sent to Hommlet as a representative of your Brother, who knew the Ranger or the Ranger had dealings with the Metalsmiths Guild.
All interesting ways to tie into the story.