What are the rules for how to play QQ Water Margin Training Camp?

Three times a day, rockets and artillery are free, and you get a warship order and a flag order respectively. Both of them can be exchanged for small gift packages, and you can also buy two kinds of experience generals that are sold on shelves (experience costs a silver ticket plus a warship list or a flag list, and it is definitely not enough to rely on free). At the end of the month at the latest, these two orders must be exchanged, otherwise the clearance will be made at 0: 00 next month.