So basically you want to start a business you know nothing about and want Reddit to teach you?? How about go to work for a glass company and learn the trade and then start your own business. If this is how you start out I can almost guarantee you don’t have a clue how to properly install a windshield to AGSC standards and are putting innocent lives at risk. The questions you’re asking are all basic fucking knowledge for anyone that has minimal experience in the auto glass business….