I am Mark Costello from Lancaster,Ohio,USA. I am looking forward to learning CAD. I am used to a Windows based system and have no other relevant experience. I have a small home based machine shop. I would like to make easier and more legible blueprints for my part libraries. These files would not be used by anyone else or seen by anyone else. I need a way to make changes to a drawing without drawing it all over again, I think I should probably move up to the 20th Century at least.. Any and all help would be greatly appreciated.