Player Shop and Player Jobs Question

[tlbearer 7]

So while I attempt to fix the black screening of my one game I started on another small project for a class. In the game there are jobs which the player can change from time to time during gameplay but there is also a shop that the player owns so they can sell what they make/find in the game. I'm not sure on how to go about making that kinda shop. I got the idea from Hometown Story for the shop and I wanted something like that and as for the job idea I got it from Fantasy Life. I'm not really sure how to do either correctly. The jobs for instance, one is a blacksmith so the player could make tools, weapons, etc with the correct gathered material and as they make stuff the level for that job increases but I'm not sure how to do that. Any help on either subject would be great.