roller chain and sprockets

Im teaching myself programing in c# and; as i have repeatedly been told the best way to learn how to program is to program. Im using books and one of them is C# Game Programming Cookbook for Unity 3D. I had Unity before I found said book and as so have been tinkering with my own ideas and one of them is making a game version of one of the machine at my job(pretty much just a virtual version) Considering my knowledge base is a fraction of that of a professional Im having to do alot of research and answer searching myself, so far the only problem i have is finding information on making a roller chain. as i said everything i know ive taught myself and Ive spent some time on StackFlow (i think thats the name) and ive notice that most users are very touchy on how questions are asked and all the details if this is the wrong feed can someone point me in the right direction....if this is the right feed then plain and simple my 2 part question is 1. how do i make a roller chain and corresponding sprockets and 2. how do i make a belt(not sure if Unity is advanced enough to care about material but a soft rubber type belt)