Unlike the old bobbin where the tension screw was visible today’s machines come with inbuilt bobbin cases. If the bobbin thread has broken tighten the needle tension a little bit.
Everything else works fine, but I have it could be a range of different things really but if your thread isnt cutting it does sound like a problem with the blade and for the threading the hook that. When the bobbin is full, it will stop automatically. Once the bobbin begins to wind, cut the excess thread.
