Cannot script tycoon costing and profjt section? [closed]

I'm creating a tycoon game, where users can collect coal, wood from trees, gas and rubbish then get money which they can buy home items, land, tools, vehicles and equipment.

I'm stuck on the coding part of the game. I've got a basic pickup script but would like someone to help me code the sava letter tycoon part please. Or at least point me in the right direction.