hey. there is a lot of factors for that, mostly how fast the object is moving, and for ISO how much light is there. it is a testing thing until you learn to feel it. Try to keep the ISO as low as possible for the shutter speed you need.
this could help
Photography Basics: Learn Manual Mode (tutorial, Part 1)
Photography Basics: Learn Manual Mode, Shutter speed (tutorial, Part 2)
Photography Basics: Learn Manual Mode, Aperture and ISO (tutorial, Part 3)
Photography Basics: Learn Manual Mode - Thinking process (Tutorial Part 4)
Thank you very much sir