This stage involves gathering all the necessary materials needed to make your product. Some factories provide materials and assembly; sometimes you will need to buy materials separately.
"Production run" means making a lot of one product at once. The factories listed under "production" can produce small and/or large quantities. The minimum order for a production run can vary from factory to factory (some have no minimum, some require a dozen, and some require up to 1,000 to be made at once)