Hi. Rethink the whole idea.
1. There's no money it it. Jobs are few and far between. The pay, for those that do find jobs, is low too.
2. Mail order schools don't teach you to use any machine shop machines and you need a firearm to work on for each lesson. IE. if you don't have a .45 or S&W revolver for the trigger job lesson, you're toast. Gets expensive acquiring the firearms and the tools needed. Nobody will lend you one either.
3. Setting up a business in your basement may or may not be legal where you are and you absolutely must know how to operate a business. You will NOT get credit from any supplier for parts or anything else. COD only, until you establish a business credit rating. Having a credit card, now, has nothing to do with it.
Illinois' laws are highly restrictive for anything firearm related too. Just wearing a hooded sweatshirt, with the hood up, while possessing or carrying a firearm is illegal.
The Sonoran Desert Institute is out to lunch.
"...teach you how to convert military rifles into sporting arms..." That drops the value of any milsurp by at least 50%. It wasn't a big deal in the late 1940's to the 70's though. Not done now though.
Module 7 is a joke. Reloading for money requires Federal permits as a minimum.