Medium format cameras can be used for sports. Your camera should be a comfortable and familiar tool that you can use almost without thinking about it. In years past some press photographers used the old Graflex 4X5s to shoot sports. Whatever equipment produces the results you want is the best choice for you. The first choice is to contact the manufacturer.
Many manufacturers can provide manuals even for discontinued models.
There is usually a charge but sometimes you get lucky. I bought a used Fuji GS 645 Professional that had no manual and wrote to the American distributor of Fuji. They sent one gratis. You could watch Ebay. There is a category for camera instructional materials and manuals.