Hi Mancc11
If the main problems are comimg from the crebellum then yes balance is a key feature of problems and you may also be experencing some problems coordinating your movement when you walk so movements may become clumsy and there may be a shaking movemnt when you move. There usually isn't true weakness as other parts of the brain tend to produce strong movements. you may of course be weak but then that mayindicate other parts of the brain may be invoved.
You will find physios who work with nervous system diseaseswill be reluctant to prescribe exercise when they have'nt properly assessed your situation -so that is a big ask over the internet. However we may be able to give you some general points to work on if you give us some more info about how you experience moving.
May I ask what the diesease is that you have? And could you describe in detail what happens when you try to walk?