design help

Question

hi everyone i am new to c# i just want some advice no code i want to do the code myself. i want to design a simple program that  displays stock that i have and if i book something out it must automaticly subtract it from the stock and display the selected stock on a page that i can print  and i must aLSO BE ABLE TO print the stock that is still left . i must also be able to add new stock items and qty's . Can someone please tell me whati need and how to do it any help will be appreciated